Download Trane Gas Unit Heaters Installation and Maintenance Manual

Installation, Operation,
and Maintenance
Gas Unit Heater
Tubular Gas-Fired Direct Spark Propeller Unit Heater
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and
servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific
knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could
result in death or serious injury. When working on the equipment, observe all precautions in the literature
and on the tags, stickers, and labels that are attached to the equipment.
March 2012
GTND-SVX01B-EN
Warnings, Cautions and Notices
Warnings, Cautions and Notices. Note that warnings,
cautions and notices appear at appropriate intervals
throughout this manual. Warnings are provide to alert
installing contractors to potential hazards that could result
in death or personal injury. Cautions are designed to alert
personnel to hazardous situations that could result in
personal injury, while notices indicate a situation that
could result in equipment or property-damage-only
accidents.
Your personal safety and the proper operation of this
machine depend upon the strict observance of these
precautions.
Read this manual thoroughly before operating or servicing
this unit.
ATTENTION: Warnings, Cautions and Notices appear at
appropriate sections throughout this literature. Read
these carefully:
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
CAUTIONs situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
a situation that could result in
NOTICE: Indicates
equipment or property-damage only
WARNING
Important
Environmental Concerns!
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment. Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
such as HCFCs and HFCs.
Responsible Refrigerant Practices!
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified. The Federal Clean Air Act
(Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain
refrigerants and the equipment that is used in these
service procedures. In addition, some states or
municipalities may have additional requirements that
© 2012 Trane All rights reserved
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.
WARNING
Personal Protective Equipment (PPE)
Required!
Installing/servicing this unit could result in exposure to
electrical, mechanical and chemical hazards.
•
Before installing/servicing this unit, technicians
MUST put on all Personal Protective Equipment (PPE)
recommended for the work being undertaken.
ALWAYS refer to appropriate MSDS sheets and OSHA
guidelines for proper PPE.
•
When working with or around hazardous chemicals,
ALWAYS refer to the appropriate MSDS sheets and
OSHA guidelines for information on allowable
personal exposure levels, proper respiratory
protection and handling recommendations.
•
If there is a risk of arc or flash, technicians MUST put
on all Personal Protective Equipment (PPE) in
accordance with NFPA 70E or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit.
Failure to follow recommendations could result in death
or serious injury.
ATTENTION: READ THIS MANUAL AND ALL LABELS
ATTACHED TO THE UNIT CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE
UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND
ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT
THESE AGREE WITH THOSE AT POINT OF INSTALLATION.
RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE
SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.
GTND-SVX01B-EN
Warnings, Cautions and Notices
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this manual could result in exposure
to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided
throughout this manual concerning these procedures.
When possible, disconnect all electrical power
including remote disconnect and discharge all energy
storing devices such as capacitors before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized. When
necessary to work with live electrical components,
have a qualified licensed electrician or other individual
who has been trained in handling live electrical
components perform these tasks. Failure to follow all of
the recommended safety warnings provided, could
result in death or serious injury.
WARNING
Overheating or Flooding Could Cause Fire
or Explosion!
Overheating or flooding (where any part of the unit
heater has been under water) could result in fire or
explosion. Should overheating occur, or the gas supply
fails to shut off, shut off the manual gas valve to the
unit heater before shutting off the electrical supply. Do
not use the unit heater if any part has been under
water. Immediately call a qualified service technician to
inspect the unit heater and replace any gas control
which has been underwater. Failure to follow these
recommendations could result in death or serious
injury.
WARNING
Hazardous Gases and Flammable
Vapors!
Exposure to hazardous gases from fuel substances
have been shown to cause cancer, birth defects or
other reproductive harm. Improper installation,
adjustment, alteration, service or use of this product
could cause flammable mixtures. To avoid hazardous
gases and flammable vapors follow proper
installation and set up of this product and all
warnings as provided in this manual. Failure to follow
all instructions could result in death or serious injury.
GTND-SVX01B-EN
Trademarks
Trane and the Trane logo are trademarks of Trane in the
United States and other countries.
3
Introduction
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury.
For Your Safety
The use and storage of gasoline or other flammable
vapors and liquids in open containers in the vicinity
of this appliance is hazardous.
If you smell gas:
1. Do not try to light any appliance.
2. Do not touch electrical switches; do not use any
phone in your building.
3. Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call your
fire department.
Approved For Use in California
WARNING
Toxic Hazard!
Install, operate and maintain unit in accordance with
manufacturer’s instructions to avoid exposure to fuel
substances or substances from incomplete combustion
which could result in death or serious illness. The state
of California has determined that these substances may
cause cancer, birth defects, or other reproductive harm.
Installer’s Responsibility
Installer Please Note: This equipment has been test fired
and inspected. It has been shipped free from defects from
our factory. However, during shipment and installation,
problems such as loose wires, leaks, or loose fasteners
may occur. It is the installer’s responsibility to inspect and
correct any problems that may be found.
Receiving Instructions
Inspect shipment immediately when received to
determine if any damage has occurred to the unit during
shipment. After the unit has been uncrated, check for any
visible damage to the unit. If any damage is found, the
consignee should sign the bill of lading indicating such
damage and immediately file claim for damage with the
transportation company.
Important:
4
It is the equipment owner’s responsibility to
provide any scaffolding or other apparatus
required to perform emergency service or
annual/periodic maintenance to this
equipment.
GTND-SVX01B-EN
Table of Contents
Warnings, Cautions and Notices . . . . . . . . . . 2
Model Number Descriptions . . . . . . . . . . . . . . 6
Indoor Gas Heating Units . . . . . . . . . . . . . . . 6
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . .46
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . .50
General Information . . . . . . . . . . . . . . . . . . . . . 7
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Safety Information . . . . . . . . . . . . . 7
Identification of Parts . . . . . . . . . . . . . . . . . . 8
Unit Dimensions and Weights . . . . . . . . . . . 12
Installation: Mechanical . . . . . . . . . . . . . . . . . 16
Air Distribution . . . . . . . . . . . . . . . . . . . . . 16
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . 17
Nozzle Assembly . . . . . . . . . . . . . . . . . . . 19
Installation: Piping . . . . . . . . . . . . . . . . . . . . . . 21
Gas Supply Piping . . . . . . . . . . . . . . . . . . . . 21
Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . 21
Pipe Installation . . . . . . . . . . . . . . . . . . . . . . 22
Installation: Venting . . . . . . . . . . . . . . . . . . . 23
Standard Combustion . . . . . . . . . . . . . . . 25
All Unit Sizes: Vertically Vented Unit Heaters
(Category I) . . . . . . . . . . . . . . . . . . . . . . . . 25
All Unit Sizes: Horizontally Vented Unit Heaters (Category III) . . . . . . . . . . . . . . . . . . . . 26
Unit Sizes 30–120 Only: Vertically Vented Unit
Heaters (Category III) . . . . . . . . . . . . . . . . 28
Separated Combustion . . . . . . . . . . . . . . 32
Unit Sizes 30–120 Only: Category III . . . . 32
Installation: Electrical . . . . . . . . . . . . . . . . . . . 37
Electrical Connections . . . . . . . . . . . . . . . . . 37
Thermostat Wiring and Location . . . . . . 37
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
All Unit Sizes: Operation . . . . . . . . . . . . . . . 39
Power Vented Propeller Units—Direct Spark
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Gas Equipment Start-Up . . . . . . . . . . . . . . . 43
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Periodic Service . . . . . . . . . . . . . . . . . . . . 44
How to Order Replacement Parts . . . . . . 45
GTND-SVX01B-EN
5
Model Number Descriptions
Indoor Gas Heating
Units
Note: All units are AGA approved. For
CGA approved units, contact Air
Handling Product Support.
Digit 1 — Gas Heating
Equipment
G
=
Gas Heating Equipment
=
=
=
=
None (Indoor Unit)
=
None (Indoor Unit and Rooftop
Duct Furnace)
Digit 14 — Rooftop Fan Section
=
None (Indoor Unit and Rooftop
Duct Furnace)
Digit 15 — Miscellaneous
Options
Digit 4 — Development
Sequence
D
Aluminized Steel
#409 Stainless Steel
#321 Stainless Steel
Digit 13 — Rooftop Heating Unit
Motor Selection
0
Natural Gas
LP Gas (Propane)
=
=
=
Digit 12 — Rooftop
Arrangements
0
Tubular Heat Exchanger Propeller Type
Digit 3 — Fuel
N
P
1
2
3
0
Digit 2 — Product Type
T =
Digit 11 — Heat Exchanger
Material
Fourth Generation
Digits 5, 6, 7 — Input Capacity
Single Furnace
003 =
30 MBh
015 =
150 MBh
004 =
45 MBh
017 =
175 MBh
006 =
60 MBh
020 =
200 MBh
007 =
75 MBh
022 =
225 MBh
009 =
90 MBh
025 =
250 MBh
011 =
105 MBh
030 =
300 MBh
120 =
120 MBh
035 =
350 MBh
040 =
400 MBh
0
B
=
=
J
7
=
=
None
Orifices For Elevation Above
2000 Feet (Specify Elevation)
Totally Enclosed Motor
OSHA Fan Guard
Digit 8 — Main Power Supply
A
=
115/60/1
D
=
230/60/3
B
=
230/60/1
E
=
460/60/3
C
=
208/60/3
F
=
575/60/3
Digit 9 — Gas Control Option
D
=
E
=
H
=
J
=
L
=
N
=
T
=
V
=
Single-Stage, Intermittent Pilot
Ignition
Two-Stage, Intermittent Pilot
Ignition
Electronic Modulating with
Room
T-Stat, Intermittent Pilot Ignition
Electronic Modulating with
Duct-Stat, Intermittent Pilot
Ignition
Electronic Modulating with
External 4–20 mA Input
Electronic Modulating with
External 0–10 Vdc Input
Single Stage Direct Spark
Ignition
Two-Stage, Direct Spark Ignition
Digit 10 — Design Sequence
G
6
=
Seventh Design
GTND-SVX01B-EN
General Information
Description
The Tubular Gas-Fired Unit Heater is a factory assembled,
power vented, low static pressure type propeller fan unit
heater designed to be suspended within the space to be
heated. THESE HEATERS ARE NOT TO BE CONNECTED TO
DUCTWORK. The designs are certified by ETL as providing
a minimum of 80 percent thermal efficiency, and approved
for use in California. Do not alter these units in any
way. If you have any questions after reading this manual,
contact the manufacturer.
Figure 1. Tubular Propeller Unit Heaters
Front view (Unit size 150)
See “Identification of Parts,” p. 8 for unit components.
General Safety Information
Important:
accordance with ANSI/NFPA No. 409, and in
public garages when installed in accordance
with NFPA No. 88A and NFPA No. 88B.
This product must be installed by a licensed
plumber or gas fitter when installed within
the Commonwealth of Massachusetts.
Unit sizes 30–120: If installed in Canada, the
installation must conform with local building
codes, or in absence of local building codes,
with CAN/CanGa-B149.1 “Installation Codes for
Natural Gas Burning Appliances and
Equipment” or CAN/CanGa-B149.2 “Installation
Codes for Propane Gas Burning Appliances and
Equipment”. These unit heaters have been
designed and certified to comply with CSA 2.6.
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury.
•
Installation must be made in accordance with
local codes, or in absence of local codes with the
latest edition of ANSI Standard Z223.1 (N.F.P.A.
No. 54) National Fuel Gas Code.
All of the ANSI and NFPA Standards referred to
in these installation instructions are those that
were applicable at the time the design of this
appliance was certified. The ANSI Standards are
available from the CSA Information Services,
1-800-463-6727. The NFPA Standards are
available from the National Fire Protection
Association, Batterymarch Park, Quincy, MA
02269.
Unit sizes 150–400: These units are designed for
use in airplane hangars when installed in
GTND-SVX01B-EN
Rear view (Unit size 150)
Unit sizes 150–400: If installed in Canada, the
installation must conform with local building
codes, or in absence of local building codes,
with CSA-B149.1 “Installation Codes for Natural
Gas Burning Appliances and Equipment” or
CSA-B149.2 “Installation Codes for Propane Gas
Burning Appliances and Equipment”. These unit
heaters have been designed and certified to
comply with CSA 2.6. Also see sections on
installation in “Aircraft Hangers,” p. 16 and
“Public Garages,” p. 16.
•
Do not alter the unit heater in any way or damage
to the unit and/or severe personal injury or death
could occur!
7
General Information
•
•
Turn off the gas supply and disconnect all
electric power, including remote disconnects
before servicing unit. Follow proper lockout/
tagout procedures to ensure the power can not
be inadvertently energized and the gas can not
be inadvertently turned on. Failure to turn off
gas or disconnect power before servicing could
result in death or serious injury.
•
Do not attach ductwork to this product or use it
as a makeup air heater. Such usage voids the
warranty and will create unsafe operation.
•
In cases in which property damage may result
from malfunction of the heater, a backup system
or a temperature sensitive alarm should be used.
•
Follow installation instructions CAREFULLY to
avoid creating unsafe conditions. All wiring
should be done and checked by a qualified
electrician, using copper wire only.
Should overheating occur, or the gas supply fail
to shut off, shut off the manual gas valve to the
heater before shutting off the electrical supply.
•
The open end of piping systems being purged
must not discharge into areas where there are
sources of ignition or into confined spaces
UNLESS precautions are taken as follows: 1) by
ventilation of the space, 2) control of purging
rate, 3) elimination of all hazardous conditions.
All precautions must be taken to perform this
operation in a safe manner.
•
When connecting to existing gas lines be sure to
valve off the gas supply ahead of connection
point. To avoid explosion or possible fire, always
purge all residual gas from piping before cutting
into existing line or removing threaded fittings.
Failure to remove all gas vapors could result in
death or serious injury or equipment or propertyonly-damage.
•
All gas connections should be made and leaktested by a suitably qualified individual, per
instructions in this manual. Also follow
procedures listed in “Gas Equipment Start-Up,”
p. 43.
•
Use only the fuel for which the unit heater is
designed (see rating plate). Using LP gas in a
heater that requires natural gas, or vice versa,
will create the risk of gas leaks, carbon
monoxide poisoning and explosion.
Important:
Do not attempt to convert the heater
for use with a fuel other than the one
intended. Such conversion is
dangerous, as it could create the risks
listed previously.
•
Make certain that the power source conforms to
the electrical requirements of the heater.
•
All field-installed wiring must be completed by
qualified personnel. All field-installed wiring
must comply with NEC and applicable local
codes. Failure to follow this instruction could
result in death or serious injuries.
•
Special attention must be given to any
grounding information pertaining to this heater.
To prevent the risk of electrocution, the heater
must be securely and adequately grounded. This
should be accomplished by connecting a
grounded conductor between the service panel
and the heater. To ensure a proper ground, the
grounding means must be tested by a qualified
electrician.
•
•
8
Do not insert fingers or foreign objects into the
heater or its air moving device. Do not block or
tamper with the heater in any manner while in
operation or just after it has been turned off, as
some parts may be hot enough to cause injury.
This heater is intended for general heating
applications ONLY. It must NOT be used in
potentially dangerous locations such as
flammable, explosive, chemical-laden or wet
atmospheres.
Unless otherwise specified, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m
1 inch = 25.4 mm
1 psig = 6.894 kPa
1 pound = 0.453 kg
1 gallon = 3.785 L
1 inch water column = 0.249 kPa
1 meter/second = FPM ÷ 196.8
1 liter/second = CFM x 0.472
1000 Btu per hour = 0.293 kW
1000 Btu/Cu. Ft. = 37.5 MJ/m3
1 cubic foot = 0.028 m3
Identification of Parts
Figure 2.
All unit sizes: Propeller parts
Fan Blade
Fan Guard
Motor
Hardware
Hardware
D4430
Note: With unit sizes 30 and 45, no rubber grommets are supplied.
GTND-SVX01B-EN
General Information
Figure 3.
Unit sizes 30–120: Unit parts
#
1.
2.
Description
Vestible Panel/Tube Assembly
(Heat Exchanger)
Bracket/Gas Train
3.
Manifold
4.
5.
Burner Assembly
Standard Orifice (a)
Natural Gas or Propane (LP) Gas
Spark Ignitor
6.
7.
8.
9.
Flame Sensor
Gas Valve
Natural or Propane (LP) Gas
Manual Rollout Safety Switch
10. Transformer, 50 VA, 115/24
11. Air Pressure Switch
12. Terminal Block Plate
13. High Limit Switch
14. Fan Motor
15. OSHA Fan Guard
16. Standard Fan
17. Fan/Guard/Motor Mount Hardware Kit
18. Flue Collector(b)
19. Power Venter (Drafter) Assembly
20. Flue Collar Assembly
21. Vinyl Tubing (Pressure Switch)
22. Power Venter Mounting Plate
23. Louver
24. Louver Spring
25. Control Board
26. Access Panel
27. Top Jacket Panel w/Insulation
28. Bottom Jacket Panel w/Insulation
29. Front Jacket Panel
30. Rear Jacket Panel
31. Bracket, Manifold
32. Tube Support Bracket
33. Green Ground Screw
34. Hanger Bracket
35. Manifold Clamp
36. Pipe Nipple
37. Left Side Panel
38. Manifold Support Bracket Kit
39. Spring
40. Grommet
41. Inlet Screen Assembly
42. Burner Box View Port
(a) The orifice shown are for units operating at normal altitudes of 0 to 2000 ft (610 m).
(b) When replacing a flue collector, make sure that the flue collector box is sealed completely with factory supplied gasket.
GTND-SVX01B-EN
9
General Information
Figure 4.
Unit sizes 30–120: Component parts
Figure 6.
Unit sizes 30–120: Power venter assembly
Figure 7.
Unit sizes 150–400: Component parts
D03
Pressure switch
Figure 5.
10
Gas valve
Unit sizes 30–120: Internal furnace
components
GTND-SVX01B-EN
General Information
Figure 8.
Figure 9.
Unit sizes 150–400: Heat exchanger
assembly
Figure 10.
Unit sizes 150–250: Power venter assembly
Figure 11.
Unit sizes 300–400: Power venter assembly
Unit sizes 150–400: Electrical control panel
Figure 12. Unit sizes 150–400: Turbulator/High limit
location
GTND-SVX01B-EN
11
Unit Dimensions and Weights
Table 1.
Unit sizes 30–120: Performance and specification data
Unit Size
PERFORMANCE DATA(a)
Input
Output
Thermal Efficiency
Free Air Delivery CFM
Air Temperature Rise
Full Load Amps at 115V
Maximum Circuit Ampacity
MOTOR DATA:
Motor
Type
RPM
Amps @ 115V
DIMENSIONAL DATA
“A” Jacket Height
“B” Overall Height
“C” Overall Depth
“D1” Center Line Height of Flue(b)
“D2” Center Line Height of Air Intake
“E” Fan Diameter
“F” Discharge Opening Height
“G” Vent Connection Diameter
“H1” Center Line of Flue Connection From Side
“H2” Center Line of Air Intake From Side
Vent Size Requirements - Standard Combustion
Category I Horizontal(c)
Category III Horizontal
Category I & III Vertical
Vent Size Requirements - Separated Combustion
Exhaust Diameter**
Intake Air Diameter
Unit Weight
Shipping Weight
30
45
60
75
90
105
120
Btu/h
(kW)
Btu/h
(kW)
%
cfm
(m3/s)
°F
(°C)
30,000
(8.8)
24,900
(7.2)
83
370
(0.175)
60
(15)
3.0
3.5
45,000
(13.2)
37,350
(10.9)
83
550
(0.260)
60
(15)
3.0
3.5
60,000
(17.6)
49,800
(14.5)
83
740
(0.349)
60
(15)
4.1
4.8
75,000
(22.0)
61,500
(18.0)
82
920
(0.434)
60
(15)
4.1
4.8
90,000
(26.4)
73,800
(21.6)
82
1,100
(0.519)
60
(15)
6.4
7.5
105,000
(30.8)
86,100
(25.2)
82
1,300
(0.614)
60
(15)
6.4
7.5
120,000
(35.2)
98,400
(28.8)
82
1,475
(0.696)
60
(15)
6.4
7.5
hp
(kW)
1/20
(0.04)
SP
1650
1.9
1/20
(0.04)
SP
1650
1.9
1/12
(0.06)
SP
1050
2.6
1/12
(0.06)
SP
1050
2.6
1/10
(0.075)
SP
1050
4.2
1/10
(0.075)
SP
1050
4.2
1/10
(0.075)
SP
1050
4.2
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
12-3/8
(314)
13-1/4
(337)
25-7/8
(632)
8-1/2
(216)
8-1/2
(216)
10
(254)
10-13/16
(275)
4
(102)
7-1/4
(184)
2-3/4
(70)
12-3/8
(314)
13-1/4
(337)
25-7/8
(632)
8-1/2
(216)
8-1/2
(216)
10
(254)
10-13/16
(275)
4
(102)
7-1/4
(184)
2-3/4
(70)
15-7/8
(403)
16-13/16
(427)
26-3/16
(665)
10-3/8
(263)
8
(203)
14
(356)
14-7/16
(367)
4
(102)
7-1/4
(184)
2-3/4
(70)
15-7/8
(403)
16-13/16
(427)
26-3/16
(665)
10-3/8
(263)
8
(203)
14
(356)
14-7/16
(367)
4
(102)
7-1/4
(184)
2-3/4
(70)
22-5/8
(574)
23-9/16
(598)
26-3/8
(670)
13-5/8
(346)
8-5/8
(219)
16
(406)
21-3/16
(538)
4
(102)
7-3/4
(197)
3-1/2
(89)
22-5/8
(574)
23-9/16
(598)
26-3/8
(670)
13-5/8
(346)
8-5/8
(219)
16
(406)
21-3/16
(538)
4
(102)
7-3/4
(197)
3-1/2
(89)
22-5/8
(574)
23-9/16
(598)
26-3/8
(670)
13-5/8
(346)
8-5/8
(219)
16
(406)
21-3/16
(538)
4
(102)
7-3/4
(197)
3-1/2
(89)
in.
(mm)
in.
(mm)
in.
(mm)
4
(102)
4
(102)
4
(102)
4
(102)
4
(102)
4
(102)
4
(102)
4
(102)
4
(102)
5
(127)
4
(102)
4
(102)
5
(127)
4
(102)
4
(102)
5
(127)
4
(102)
4
(102)
5
(127)
4
(102)
4
(102)
in.
(mm)
in.
(mm)
lb
(kg)
lb
(kg)
4
(102)
4
(102)
60
(27)
70
(32)
4
(102)
4
(102)
65
(29)
75
(34)
4
(102)
4
(102)
80
(36)
90
(41)
4
(102)
4
(102)
85
(39)
95
(43)
5
(127)
5
(127)
95
(43)
110
(50)
5
(127)
5
(127)
105
(48)
115
(52)
5
(127)
5
(127)
110
(50)
120
(54)
(a) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610 m). For unit installations in USA above 2000 ft. (610 m), the unit
input must be derated 4% for each 1000 ft. (305 m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the
National Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54). Also refer to Table 10, p. 42.
For installations in Canada, any reference to deration at altitudes in excess of 2000 ft. (610 m) are to be ignored. At altitudes of 2000 to 4500 ft. (610
to 1372 m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification.
(b) For all installations, the flue collar is included with the unit and should be field-installed per the instructions included with the unit.
(c) 4”–5” reducer supplied where required.
12
GTND-SVX01B-EN
Unit Dimensions and Weights
Figure 13. Unit sizes 30–120: Dimensions, standard units
GTND-SVX01B-EN
13
Unit Dimensions and Weights
Table 2.
Unit sizes 150–400: Performance and specification data
Unit Size
PERFORMANCE DATA(a)
Input
Output
Thermal Efficiency
Free Air Delivery CFM
Air Temperature Rise
Full Load Amps at 115V
MOTOR DATA:
Motor
Type
RPM
Amps @ 115V
DIMENSIONAL DATA
“A” Overall Height to Top of Flue
“B” Jacket Width of Unit
“C” Width to Centerline Flue
“D” Depth to Rear of Housing
“E” Hanging Distance Width
“F” Discharge Opening Width
“G” Depth to Centerline Flue
“H” Discharge Opening Height
“L” Overall Unit Width
Flue Size Diameter(b)
Fan Diameter
Gas Inlet-Natural Gas
Gas Inlet-LP Gas
Approx. Unit Weight
Approx. Ship Weight
150
175
200
250
300
350
400
Btu/h
(kW)
Btu/h
(kW)
%
cfm
(m3/s)
°F
(°C)
150,000
(43.9)
124,500
(36.4)
83
2,400
(1.133)
47
(26)
5.8
175,000
(51.2)
145,250
(42.5)
83
2,850
(1.346)
46
(26)
8.0
200,000
(58.6)
166,000
(48.6)
83
3,200
(1.511)
47
(26)
8.0
250,000
(73.2)
207,500
(60.7)
83
3,450
(1.629)
54
(30)
8.0
300,000
(87.8)
249,000
(72.9)
83
5,000
(2.361)
45
(24)
11.3
350,000
(102.5)
290,500
(85.1)
83
5,600
(2.644)
47
(26)
13.5
400,000
(117.1)
332,000
(97.2)
83
5,800
(2.738)
51
(28)
13.5
hp
(kW)
1/4
(0.19)
PSC
1,140
4.7
1/3
(0.25)
PSC
1,140
5.8
1/3
(0.25)
PSC
1,140
5.8
1/3
(0.25)
PSC
1,140
5.8
1/4 (2)
(0.19)
PSC
1,140
9.4
1/3 (2)
(0.25)
PSC
1,140
11.6
1/3 (2)
(0.25)
PSC
1,140
11.6
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in.
(mm)
in. (Qty)
in.
in.
lb
(kg)
lb
(kg)
33-3/4
(857)
20-3/4
(527)
13-3/8
(340)
11
(279)
18-5/8
(473)
18-3/4
(476)
4-3/4
(121)
24-1/2
(622)
25-1/4
(641)
5
(127)
16
1/2
1/2
155
(70)
195
(88)
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
(127)
18
1/2
1/2
191
(87)
241
(109)
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
(127)
18
1/2
1/2
201
(91)
251
(114)
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
(127)
18
3/4
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
(152)
16 (2)
3/4
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
(152)
18 (2)
3/4
211
(96)
261
(118)
307
(139)
367
(166)
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
(152)
18 (2)
3/4
1/2 or 3/4
321
(145)
381
(173)
335
(152)
395
(179)
(a) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610 m). For unit installations in USA above 2000 ft. (610 m), the unit
input must be derated 4% for each 1000 ft. (305 m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the
National Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).
For installations in Canada, any reference to deration at altitudes in excess of 2,000 ft. (610 m) are to be ignored. At altitudes of 2,000 ft. to 4,500 ft.
(610 m to 1372 m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification.
(b) Flue collar is factory-supplied with unit; to be field-installed per included instructions.
14
GTND-SVX01B-EN
Unit Dimensions and Weights
Figure 14. Unit sizes 150–400: Dimensions, standard units
1-3/8"
(35)
(Hanging)
E
(Hanging)
D
Flue *
C
G
11-5/8"
(295)
(Hanging)
32-1/2"
(826)
L
B
H
(Discharge
Opening)
A
33"
Electrical Control Panel
F
(Discharge Opening)
Gas Valve
D4617
Rear View
GTND-SVX01B-EN
Side View
1" (25)
Front View
15
Installation: Mechanical
NOTICE:
Equipment Damage!
Do not install unit heaters in corrosive or flammable
atmospheres! Premature failure of, or severe damage to
the unit could result! Avoid locations where extreme
drafts can affect burner operation. Unit heaters must
not be installed in locations where air for combustion
would contain chlorinated, halogenated or acidic
vapors. If located in such an environment, premature
failure of the unit could occur!
Since the unit is equipped with an automatic gas ignition
system, the unit heaters must be installed such that the gas
ignition control system is not directly exposed to water
spray, rain, or dripping water.
Additional Requirement for Canadian
Installations
Refer to specification table and installation manual for
proper usage.
The following instructions apply to Canadian installations
in addition to installation and operating instructions:
1. Installation must conform with local building codes, or
in the absence of local codes, with current CSA B149.1,
“Installation Codes for Natural Gas Burning
Appliances and Equipment”, or CSA B149.2,
“Installation Codes for Propane Gas Burning
Appliances and Equipment”.
2. Any reference to U. S. standards or codes in these
instructions are to be ignored, and the applicable
Canadian standards or codes applied.
Note: Location of unit heaters is related directly to the
selection of sizes. Basic rules are as follows:
Mounting Height. Mounting height varies by unit size:
Unit sizes 30–120: If the unit heater is installed in a garage,
it must be installed with a minimum clearance above the
floor of 18 inches (457 mm).
Unit sizes 150–400: Unit heaters equipped with standard
fan guards must be installed at a minimum of 8 feet (2.4 m)
above the floor, measured to the bottom of the unit. At
heights above 8 feet (2.4 m), less efficient air distribution
will result. If a unit is to be mounted below 8 feet (2.4 m)
from the floor, an OSHA approved fan guard is required on
the unit.
Canada, installation is suitable in aircraft hangars when
acceptable to the enforcing authorities.
Public Garages. Unit sizes 150–400: In repair garages,
unit heaters must be located at least 8 feet (2.4 m) above
the floor. Refer to the latest edition of NFPA 88B, Repair
Garages.
In parking structures, unit heaters must be installed so that
the burner flames are located a minimum of 18 inches
(457 mm) above the floor or protected by a partition not
less than 18 inches (457 mm) high. However, any unit
heater mounted in a parking structure less than 8 feet
(2.4 m) above the floor must be equipped with an OSHA
approved fan guard. Refer to the latest edition of
NFPA 88A, Parking Structures.
In Canada, installation must be in accordance with the
latest edition of CSA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
Air Distribution
Direct air towards areas of maximum heat loss. When
multiple heaters are involved, circulation of air around the
perimeter is recommended where heated air flows along
exposed walls. Satisfactory results can also be obtained
where multiple heaters are located toward the center of
the area with heated air directed toward the outside walls.
Be careful to avoid all obstacles and obstructions which
could impede the warm air distribution patterns.
NOTICE:
Maintain Minimum Thermostat Setting!
Unit heaters should not be installed to maintain low
temperatures and/or freeze protection of buildings. A
minimum of 50°F (10°C) thermostat setting must be
maintained. If unit heaters are operated to maintain
lower than 50°F (10°C), hot flue gases are cooled inside
the heat exchanger to a point where water vapor (a flue
gas by-product) condenses onto the heat exchanger
walls. The result is a mildly corrosive acid that
prematurely corrodes the aluminized heat exchanger
and can actually drip water down from the unit heater
onto the floor surface. Additional unit heaters should
be installed if a minimum 50°F (10°C) thermostat
setting cannot be maintained. Failure to follow these
recommendations could result in equipment or
property damage.
Aircraft Hangers. Unit sizes 150–400: Unit heaters must
be installed in aircraft hangars as follows: in aircraft
hangars, unit heaters must be at least 10 feet (3.0 m) above
the upper surface of wings or engine enclosures of the
highest aircraft to be stored in the hangar, and 8 feet
(2.4 m) above the floor in shops, offices and other sections
of the hangar where aircraft are not stored or housed.
Refer to current ANSI/NFPA No. 409, Aircraft Hangars. In
16
GTND-SVX01B-EN
Installation: Mechanical
WARNING
Overheating or Flooding Could Cause Fire
or Explosion!
Overheating or flooding (where any part of the unit
heater has been under water) could result in fire or
explosion. Should overheating occur, or the gas supply
fails to shut off, shut off the manual gas valve to the
unit heater before shutting off the electrical supply. Do
not use the unit heater if any part has been under
water. Immediately call a qualified service technician to
inspect the unit heater and replace any gas control
which has been underwater. Failure to follow these
recommendations could result in death or serious
injury.
WARNING
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances
have been shown to cause cancer, birth defects or other
reproductive harm. Improper installation, adjustment,
alteration, service or use of this product could cause
flammable mixtures. To avoid hazardous gases and
flammable vapors follow proper installation and set up
of this product and all warnings as provided in this
manual. Failure to follow all instructions could result in
death or serious injury.
Air for Combustion. The unit heater shall be installed in
a location in which the facilities for ventilation permit
satisfactory combustion of gas, proper venting, and the
maintenance of ambient temperature at safe limits under
normal conditions of use. The unit heater shall be located
in such a manner as not to interfere with proper circulation
of air within the confined space. When buildings are so
tight that normal infiltration does not meet air
requirements, outside air shall be introduced per Sections
1.3.4.2 and 1.3.4.3 of ANSI Z223.1 for combustion
requirements. A permanent opening or openings having a
total free area of not less than one square inch per
5,000 Btu/h (1.5 Kw) of total input rating of all appliances
within the space shall be provided.
Note: Unit heater sizing should be based on heat loss
calculations where the unit heater output equals or
exceeds heat loss.
Clearances
Each gas unit heater shall be located with respect to
building construction and other equipment so as to permit
access to the Unit Heater.
Unit sizes 30–120: Clearance between vertical walls and
the vertical sides of the unit heater shall be no less than
1 inch (25.4 mm). However, to ensure access to the control
box and fan, a minimum of 18 inches (457 mm) is required
for the fan, and control box side. A minimum clearance of
1 inch (25.4 mm) must be maintained between the top of
GTND-SVX01B-EN
the Unit Heater and the ceiling. The bottom of the Unit
Heater must be no less than 1 inch (25.4 mm) from any
combustible. The distance between the flue collector and
any combustible must be no less than 1 inch (25.4 mm).
Unit sizes 150–400: Clearance between vertical walls and
the vertical sides of the unit heater shall be no less than
6 inches (152 mm). However, to ensure access to the
control box, a minimum of 18 inches (457 mm) is required
for the control box side. A minimum clearance of 6 inches
(152 mm) must be maintained between the top of the unit
heater and the ceiling. The bottom of the unit heater must
be no less than 12 inches (305 mm) from any combustible.
The distance between rear of unit and vertical wall should
be no less than 18 inches to maintain inlet air flow. The
distance between the flue collector and any combustible
must be no less than 6 inches (152 mm).
Also refer to “Air for Combustion,” p. 17 and “Installation:
Venting,” p. 23 sections.
Note: Increasing the clearance distances may be
necessary if there is a possibility of distortion or
discoloration of adjacent materials.
Unit Mounting.
WARNING
Heavy Objects!
Make certain that the lifting methods used to lift the
heater and the method of suspension used in the field
installation of the heater are capable of uniformly
supporting the weight of the heater at all times. Make
certain that the structure to which the heater is
mounted is capable of supporting its weight. Under no
circumstances must the gas lines, the venting system
or the electrical conduit be used to support the heater;
or should any other objects (i.e. ladder, person) lean
against the heater, gas lines, venting system or the
electrical conduit for support. Failure to follow
recommendations could result in death or serious
injury.
NOTICE:
Equipment Damage!
Unit heaters must be hung level from side to side and
from front to back:
•
Unit sizes 30–120: Refer to Figure 15, p. 18 through
Figure 17, p. 18.
•
Unit sizes 150–400: Refer to Figure 18, p. 19 through
Figure 20, p. 19.
Failure to do so will result in poor performance and or
premature failure of the unit.
17
Installation: Mechanical
WARNING
Figure 16. Unit sizes 30–120: Heater mounting (steel
construction)
Heavy Objects!
Ensure that all hardware used in the suspension of each
unit heater is capable of supporting the unit weight.
Failure to do so could result in unit falling off its
mounting location, which could result in death or
serious injury.
Unit sizes 30–120 only: The unit heater may be mounted
with the vent outlet, gas and electrical connections to the
right or left of the air moving fan. The unit heater is shipped
with the connections to the right of the fan when looking
in the direction of the air flow. If connections to the right
are required, remove hanger brackets from face of unit and
attach as pictured in Figure 15, p. 18. If connections to the
left are required, invert the heater (180°), mount the
hanging brackets as above, and remove, invert, and
replace the control access panel and the air discharge
louvers.
Figure 17.
Unit sizes 30–120: Heater mounting (wood
construction)
The unit heater may be mounted by fastening the hanging
brackets directly to ceiling joists or by suspending from
four rods (see Figure 15, p. 18 through Figure 17, p. 18).
For suspension of units, refer to the figures:
• Unit sizes 30–120: Refer to Figure 15, p. 18 through
Figure 17, p. 18.
• Unit sizes 150–400: Refer to Figure 18, p. 19 through
Figure 20, p. 19.
Figure 15. Unit sizes 30–120: Hanger bracket
installation instructions
18
GTND-SVX01B-EN
Installation: Mechanical
to temporarily attach the top bracket
(P/N 252-07948-00X).
Figure 18. Unit sizes 150–400: Flue collar adapter
installation
a. Using the holes in the top bracket as a guide, predrill a 1/8” (0.125”) hole at each location across the
front panel of the unit heater.
b. Using the enclosed screws, permanently attach the
top bracket.
3. Remove the upper two (2) screws from the lower
section on the front of the unit heater. Repeat the
procedure described in Step 2 using the bottom
bracket (P/N 252-07949-00X).
4. Using the sixteen (16) 5/16-12 x 1/2 screws, attach the
left and right side panel (P/N 251-07944 and 251-07946)
to the unit heater using the holes to which the louvers
were attached.
5. Using the enclosed #8-18 x 1/2 screws and with the top
panel oriented such that the side with the larger holes
is facing the unit heater, attach the top panel
(P/N 251-07942-00X) to the top bracket and the two (2)
side panels.
Figure 19. Unit sizes 150–400: Heater mounting(a)
Note: The top panel must be attached so that the side
with the larger holes is facing the unit heater;
this is a requirement for later steps in this
installation procedure.
6. Using the enclosed #8-18 x 1/2 screws and with the
bottom panel oriented such that the side with the larger
holes is facing the unit heater, attach the bottom panel
(P/N 251-07943-00X) to the bottom bracket and the two
(2) side panels.
Note: The bottom panel must be attached so that the
side with the larger holes is facing the unit
heater; this is a requirement for later steps in
this installation procedure.
(a) All hanging hardware and wood is not included with the unit (to be field supplied).
Figure 20. Unit sizes 150–400: Wood construction joists
Note: See Table 2, p. 14 for “E” dimension.
Nozzle Assembly
Use the following procedure for assembling the 30-, 60-, or
90-degree nozzle assembly to your unit heater.
1. Remove the louvers and the cone springs from the unit
heater.
2. Remove the four (4) screws from the upper section of
the front of the unit heater and use these same screws
GTND-SVX01B-EN
7.
For 30-degree nozzle assemblies: Go to Step 10.
8. For 60- and 90-degree nozzle assemblies: Using the
enclosed #8-18 x 1/2 screws and with the top and
bottom panels oriented such that the sides with the
19
Installation: Mechanical
larger holes are facing the unit heater, create a
sub-assembly by attaching the top panel
(P/N 251-07942-00X) and the bottom panel
(P/N 251-07943-00X) to the left side panel
(P/N 251-07945) and to the right side panel
(P/N 251-07947).
10. Install the louvers and cone springs.
Note: The top and bottom panels must be attached so
that the sides with the larger holes are facing
the unit heater; this makes the assembly easier.
Note: For 90-degree nozzle assemblies, repeat Step 8
to create a second sub-assembly.
9. For 60- and 90-degree nozzle assemblies: Using the
enclosed #8-18 x 1/2 screws, attach the sub-assembly
created in Step 8 to the 30-degree assembly installed to
the unit (in Step 1 through Step 6 of this procedure).
Attach the corresponding panels (i.e., top panel to top
panel, right side panel to right side panel, etc).
Note: For 90-degree nozzle assemblies, install the
second sub-assembly by attaching it to the first
sub-assembly. Attach the corresponding panels
(i.e., top panel to top panel, right side panel to
right side panel, etc).
20
GTND-SVX01B-EN
Installation: Piping
Gas Supply Piping
WARNING
Flammable Vapors!
When connecting to existing gas lines be sure to valve
off the gas supply ahead of connection point. To avoid
explosion or possible fire, always purge all residual gas
from piping before cutting into existing line or
removing threaded fittings. Failure to remove all gas
vapors could result in death or serious injury or
equipment or property-only damage.
Pipe Sizing
To provide adequate gas pressure at the gas unit heater,
size the gas piping as follows:
1. Find the ft3/hr by using the following formula:
ft3/hr =
Input
Btu per ft3
2. Refer to Table 3, p. 22. Match “Length of Pipe” with
appropriate “Gas Input - Ft3/Hr” value. This value can
then be matched to the pipe size at the left of the table.
Example: It is determined that a 67 foot (20.4 m) run of
gas pipe is required to connect a 200 MBtu gas unit
heater to a 1,000 Btu/ft3 (0.29 kW) natural gas supply.
200,000 Btu/hr
1,000 Btu/ft3
= 200 ft3/hr
Using Table 3, p. 22, a 1-inch pipe is needed.
Notes:
•
See “General Safety Information,” p. 7 for English/SI
(metric) unit conversion factors.
•
If more than one gas unit heater is to be served by the
same piping arrangement, the total cubic feet per hour
input and length of pipe must be considered.
•
If the gas unit heater is to be fired with LP gas, consult
the local LP gas dealer for pipe size information.
WARNING
Hazard of Explosion and Fire!
Heater installation for use with propane (LP gas) must
be made by a qualified LP Gas Dealer or LP Gas Installer
to ensure that all appropriate codes, installation
procedures, and precautions have been followed.
Failure to follow these instructions could result in death
or serious injury.
Before any connection is made to an existing line
supplying other gas appliances, contact the local gas
company to make certain that the existing line is of
adequate size to handle the combined load.
GTND-SVX01B-EN
21
Installation: Piping
Table 3.
All unit sizes: Gas pipe size
Nominal Internal
10
Iron Pipe Diameter,
Size, in.
in. (mm)
(3.0)
1/2
Length of Pipe, ft (m)
20
(6.1)
30
40
50
60
70
80
90
100
125
150
175
200
(9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)
0.622
175
120
97
82
73
66
61
57
53
50
44
40
37
35
(16)
(4.96)
(3.40)
(2.75)
(2.32)
(2.07)
(1.87)
(1.73)
(1.61)
(1.50)
(1.42)
(1.25)
(1.13)
(1.05)
(0.99)
0.824
360
250
200
170
151
138
125
118
110
103
93
84
77
72
(21)
(10.2)
(7.08)
(5.66)
(4.81)
(4.28)
(3.91)
(3.54)
(3.34)
(3.11)
(2.92)
(2.63)
(2.38)
(2.18)
(2.04)
1.049
680
465
375
320
285
260
240
220
205
195
175
160
145
135
(27)
(19.3)
(13.2)
(10.6)
(9.06)
(8.07)
(7.36)
(6.80)
(6.23)
(5.80)
(5.52)
(4.96)
(4.53)
(4.11)
(3.82)
1-1/4
1.380
1400
950
770
660
580
530
490
460
430
400
360
325
300
280
(35)
(39.6)
(26.9)
(21.8)
(18.7)
(16.4)
(15.0)
(13.9)
(13.0)
(12.2)
(11.3)
(10.2)
(9.20)
(8.50)
(7.93)
1-1/2
1.610
2100
1460
1180
990
900
810
750
690
650
620
550
500
460
430
(41)
(59.5)
(41.3)
(33.4)
(28.0)
(25.5)
(22.9)
(21.2)
(19.5)
(18.4)
(17.6)
(15.6)
(14.2)
(13.0)
(12.2)
2
2.067
3950
2750
2200
1900
1680
1520
1400
1300
1220
1150
1020
950
850
800
(53)
(112)
(77.9)
(62.3)
(53.8)
(47.6)
(43.0)
(39.6)
(36.8)
(34.5)
(32.6)
(28.9)
(26.9)
(24.1)
(22.7)
2-1/2
2.469
6300
4350
3520
3000
2650
2400
2250
2050
1950
1850
1650
1500
1370
1280
(63)
(178)
(123)
(99.7)
(85.0)
(75.0)
(68.0)
(63.7)
(58.0)
(55.2)
(52.4)
(46.7)
(42.5)
(38.8)
(36.2)
3.068
11000
7700
6250
5300
4750
4300
3900
3700
3450
3250
2950
2650
2450
2280
(78)
(311)
(218)
(177)
(150)
(135)
(122)
(110)
(105)
(97.7)
(92.0)
(83.5)
(75.0)
(69.4)
(64.6)
4.026
23000
15800
12800
10900
9700
8800
8100
7500
7200
6700
6000
5500
5000
4600
(102)
(651)
(447)
(362)
(309)
(275)
(249)
(229)
(212)
(204)
(190)
(170)
(156)
(142)
(130)
3/4
1
3
4
Notes:
1. Determine the required ft3/h by dividing the rated heater input by 1000. For SI / Metric measurements: Convert unit Btu/h to kilowatts. Multiply the
unit input (kW) by 0.0965 to determine m3/h.
2. FOR NATURAL GAS: Select the pipe size directly from the table.
3. FOR PROPANE GAS: Multiply the ft3/h (m3/h) value by 0.633; then use the table.
4. Refer to the metric conversion factors listed in “General Safety Information,” p. 7 for more SI unit measurements/conversions.
Pipe Installation
1. Install the gas piping in accordance with applicable
local codes.
2. Check gas supply pressure. Each unit heater must be
connected to a gas supply capable of supplying its full
rated capacity as specified in Table 4, p. 23. A field LP
tank regulator must be used to limit the supply
pressure to maximum of 14 in. wc (3.5 kPa). All piping
should be sized in accordance with the latest edition of
ANSI Standard Z223.1 National Fuel Gas Code; in
Canada, according to CSA-B149.
Unit sizes 150–400: Unit sizes 150–400 must also be
connected to a manifold pressure.
If gas pressure is excessive on natural gas applications,
install a pressure regulating valve in the line upstream
from the main shutoff valve.
For correct gas supply piping size, refer to the tables:
• Unit sizes 30–120: Refer to Table 1, p. 12.
• Unit sizes 150–400: Refer to Table 2, p. 14.
• All unit sizes: Refer to Table 3, p. 22, Table 4, p. 23,
Table 9, p. 41, and Table 10, p. 42.
If gas pressure is excessive on natural gas applications,
install a pressure regulating valve in the line upstream
from the main shutoff valve.
WARNING
Hazard of Explosion!
Adequately support the piping to prevent strain on the
gas manifold and controls. To prevent explosion, fire, or
gas leaks, support piping so that piping does not sag or
put pressure on the burners internal to the unit. Failure
to follow these recommendations could result in death
or serious injury or equipment or property-onlydamage.
3. To prevent the mixing of moisture with gas, run the
take-off piping from the top, or side, of the main.
4. Standard unit heaters (all unit sizes) and optional twostage units (unit sizes 150–400) are supplied with a
combination valve which includes:
a. Manual “A” valve
b. Manual “B” valve
c. Solenoid valve
d. Pressure regulator
22
GTND-SVX01B-EN
Installation: Piping
Pipe directly in to combination valve (see Figure 21,
p. 23).
5. Gas valve has a pressure test post requiring a 3/32” hex
head wrench to read gas supply and manifold
pressures. Open 1/4 turn counterclockwise to read,
turn clockwise to close and reseat. A 5/16” ID hose fits
the pressure post.
6. Provide a drip leg in the gas piping near the gas unit
heater. A ground joint union and a manual gas shutoff
valve should be installed ahead of the unit heater
controls to permit servicing. The manual main shutoff
valve must be located external to the jacket (see
Figure 21, p. 23).
7.
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
Table 4.
Gas Type
Overtightening!
Do not overtighten the inlet gas piping into the valve.
This may cause stresses that could crack the valve!
Note: Use pipe joint sealant resistant to the action of
liquefied petroleum gases regardless of gas
conducted.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Failure to follow
recommended safe leak test procedures could result in
death or serious injury or equipment or property-onlydamage.
Figure 21. All unit sizes: Pipe installation, standard
controls
Natural Gas
Propane (LP) Gas
Single Stage Gas Piping Requirements(b)
Manifold Pressure
Supply Inlet Pressure
Make certain that all connections have been
adequately doped and tightened.
NOTICE:
All unit sizes: Gas piping requirements(a)
3.5 in. wc
10.0 in. wc
(0.9 kPa)
(2.5 kPa)
14.0 in. wc Max.
14.0 in. wc Max.
(3.5 kPa)
(3.5 kPa)
5.0 in wc Min.
11.0 in wc Min.
(1.2 kPa)
(2.7 kPa)
(a) For single stage applications only, at altitudes below 2,001 feet.
(b) For single stage applications only, at normal altitudes
Installation: Venting
All unit heaters must be vented!
WARNING
Carbon Monoxide!
Your venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! A blocked venting system could result in carbon
monoxide poisoning. Symptoms of such condition
include grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms. Failure to follow these
recommendations could result in death or serious
injury.
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
Never use a pipe of diameter other than that specified:
•
Unit sizes 30–120: Use 4” (120 mm) flue pipe.
•
Unit sizes 150–400: Refer to Table 2, p. 14!
To prevent pipe from melting and introducing exhaust
fumes into the air supply, never use PVC, ABS or any
other non-metallic pipe for venting! To prevent fan
restriction, an elbow should never be attached directly
to the venter. Failure to follow these recommendations
could result in death or serious injury or equipment
damage.
D3631C
ANSI now organizes vented appliances into four
categories.
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
GTND-SVX01B-EN
23
Installation: Piping
Table 5.
exhaust fans, fireplace dampers, and any other gasburning appliance to their previous condition of use.
All unit sizes: Venting categories
Non Condensing
Condensing
Negative Vent Pressure
I
II
Positive Vent Pressure
III
IV
Category I
Includes non-condensing appliances with negative vent
pressure, like the traditional atmospheric unit heater.
Category II
Groups condensing appliances with negative vent
pressure.
Category III
Appliances are non-condensing and operate with a
positive vent pressure.
Category IV
Covers condensing appliances with positive vent
pressure.
Note: Category II and IV do not apply to equipment
specified within this manual.
When an existing heater is removed or replaced in venting
system, the venting system may not be properly sized to
vent the attached appliances. An improperly sized vent
system can cause formulation of condensate or leakage or
spillage of flue gases.
The following steps shall be followed with each appliance
connected to the venting system placed in operation,
while any other appliances connected to the venting
system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1 and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies, which could cause an
unsafe condition.
3. Insofar as practical, close all building doors and
windows and all doors between the space in which the
appliance(s) connected to the venting system are
located and other spaces of the building. Turn on
clothes dryers and any exhaust fans, such as range
hoods and bathroom exhausts, so they shall operate at
maximum speed. Do not operate a summer exhaust
fan. Close fireplace damper.
6. If improper venting is observed during any of the
above tests, the venting system must be corrected
immediately so that the system conforms with the
National Fuel Gas Code, ANSI Z223.1. When resizing
any portion of the venting system, the venting system
should be resized to approach the minimum size as
determined using the appropriate tables in
Appendix G of the National Fuel Gas Code, ANSI
Z223.1.
The unit heater shall be connected to a factory built
chimney or vent complying with a recognized standard, or
a masonry or concrete chimney lined with a lining material
acceptable to the authority having jurisdiction. Venting
into an unlined masonry chimney is prohibited.
The following guidelines apply to all categories to follow:
Table 6.
Unit sizes 30–120: Vent systems termination
clearance requirements
Structure
Minimum for
Termination Locations
4 feet below
Door, window or any gravity vent inlet 4 feet horizontally
1 foot above
Forced air inlet within 10 feet
3 feet above
Adjoining building or parapet
6 feet
Adjacent public walkways
7 feet above grade
Electric, gas meters & regulators
4 feet horizontal
Do not damper or add heat recovery devices to the flue
piping. Failure to open such a damper prior to operating
the gas unit heater will result in the spillage of flue gas into
the occupied space.
Avoid installing units in areas under negative pressure.
When required, a flue vent fan should be installed in
accordance with the instructions included with the fan.
Vent connectors serving Category I and Category II
heaters shall not be connected into any portion of
mechanical draft systems operating under positive vent
pressure.
Maintain 1-inch (25.4-mm) clearance between the vent
pipe and combustible materials.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
that the appliance will operate continuously.
5. After it has been determined that each appliance
connected to the venting system properly vents when
tested as outline above, return doors, windows,
24
GTND-SVX01B-EN
Installation: Piping
Standard Combustion
All Unit Sizes: Vertically Vented Unit
Heaters (Category I)
WARNING
Carbon Monoxide!
Never operate unit heaters without combustion air and
flue gas piping in place. Each unit heater MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. Your
venting system must not be blocked by any snow, snow
drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! Failure to follow these recommendations could
result in death or serious injury.
Unit sizes 150–400: Install an Amerivent Americap or
Metalbestos vent cap over the vent opening.
4. Slope horizontal runs upward from the gas unit heater
at least 1/4-inch per foot (21-mm/m) minimum.
Horizontal Vent Connector length should not exceed
75% of the vertical height of the vent pipe, or chimney,
above the flue pipe connection. Maximum vent
connector length is 10 feet (3 m). For exceptions see
Ch. 10 of the National Fuel Gas Code, ANSI Z223.1.
Horizontal portions of the venting system shall be
supported at maximum intervals of 4 feet (1.2 m): see
Figure 22, p. 26; in Canada, support at 3-foot intervals
(1-m) minimum intervals. Maintain clearance between
the vent pipe and combustible materials per vent pipe
manufacturer’s instructions.
5. Use as few elbows as possible.
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
6. Seal all vent pipe joints and seams to prevent leakage.
Use General Electric RTV-108, Dow-Corning RTV-732,
or equivalent silicone sealant with a temperature
rating of 500°F, or 3M #425 aluminum foil tape (or
equivalent). Tape flue pipe joints with high-temp, RTV
or foil face tape.
Never use a pipe of diameter other than that specified:
7.
•
Unit sizes 30–120: Use 4” (120 mm) flue pipe.
•
Unit sizes 150–400: Refer to Table 2, p. 14!
To prevent pipe from melting and introducing exhaust
fumes into the air supply, never use PVC, ABS or any
other non-metallic pipe for venting! To prevent fan
restriction, an elbow should never be attached directly
to the venter. Failure to follow these recommendations
could result in death or serious injury or equipment
damage.
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue connections
on the gas unit heater:
• Unit sizes 30–120: Use 4” (120 mm) flue pipe.
• Unit sizes 150–400: Refer to Table 2, p. 14.
All heaters must vented with UL Listed Type B vent (or,
for unit sizes 30–120, single wall vent), a factory built
chimney, or a lined brick and mortar chimney that has
been constructed in accordance with the National
Building Code.
Avoid running vent pipe through unheated spaces.
When this cannot be avoided, insulate the pipe to
prevent condensation of moisture on the walls of the
pipe. Insulate vent pipe runs longer than 10 ft (3 m).
Insulation should be a minimum of 1/2” (12.7 mm)
thick foil faced.
8. Do not damper the flue piping. Failure to open such a
damper prior to operating the gas unit heater will result
in the spillage of flue gas into the occupied space.
9. Avoid installing units in areas under negative pressure
due to large exhaust fans or air conditioning. When
required, a flue vent fan should be installed in
accordance with the instructions included with the fan.
10. Vent connectors serving Category I and Category II
heaters shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
Unit sizes 30–120: All tables and dimensions assume B
vent for the flue and single wall pipe or B vent for the
connector.
2. Unit sizes 30–120: Unit may be common vented when
installed in accordance with NFPA-54 guidelines.
3. Provide as long a vertical run of flue pipe at the gas unit
heater as possible. A minimum of 5 feet (1.5 m) of
vertical flue is required for Category I venting. The top
of the vent pipe should extend at least 2 feet (0.61 m)
above the highest point on the roof. Consideration
should be made for anticipated snow depth.
GTND-SVX01B-EN
25
Installation: Piping
Figure 22. All unit sizes: Vertical venting (Category I)
Approved Vent Terminal
2 feet Min.
(0.61 m Min.)
Use Insulated Stack Outdoors
Thimble
Roof
5 feet Min.
1.52 m Min.
Unit sizes 30–120: 1” (25.4 mm) minimum
distance from pipe to ceiling
Unit sizes 150–400: 6” (152 mm)
minimum distance from pipe to ceiling
1/4” Min.
(6 mm)*
1 foot
(305 mm)*
*1/4” per foot (21 mm per m)
10 feet Max. (3.05 m)
(Not to exceed 75% of Vertical
Flue Height)
All Unit Sizes: Horizontally Vented Unit
Heaters (Category III)
WARNING
Carbon Monoxide!
Never operate unit heaters without combustion air and
flue gas piping in place. Each unit heater MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. Your
venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! Failure to follow these recommendations could
result in death or serious injury.
Unit sizes 150–400: Horizontal venting arrangements are
designed to be used with single wall vent pipe. Horizontal
venting arrangements must terminate external to the
building using either single wall or double wall (Type B)
vent. If single wall vent pipe is used, it must be constructed
of 26-gauge galvanized steel or a material of equivalent
durability and corrosion resistance for the vent system.
For installations in Canada, use corrosion-resistant and
gas-tight, listed vent pipe conforming with local building
codes, or in the absence of local building codes, with
current CSA-B149.1, “Installation Codes for Natural Gas
Burning Appliances and Equipment” or CSA-B149.2,
“Installation Codes for Propane Gas Burning Appliances
and Equipment”. Refer to Figure 26, p. 28, Figure 28, p. 30,
and Figure 30, p. 31 for special installation requirements
regarding these venting conditions.
26
WARNING
Risk of Carbon Monoxide Poisoning with
Type B Vent!
Unit sizes 150–400: Do not use a Type B (double wall)
vent internally within the building on power vented
units! Type B vent does not seal well under positive
pressure and could result in exhaust fume leaks. Failure
to follow these recommendations could result in death
or serious injury.
Unit sizes 150–400: If double wall venting (other than
Type B; see preceding warning) is used, components
which are UL-Listed and approved for Category III
positive pressure venting systems MUST be used.
Table 7.
All unit sizes: Vent systems termination
clearance requirements
Structure
Minimum for
Termination Locations
4 feet below
Door, window or any gravity vent inlet 4 feet horizontally
1 foot above
Forced air inlet within 10 feet
3 feet above
Adjoining building or parapet
6 feet
Adjacent public walkways
7 feet above grade
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue connection(s)
on the gas unit heater:
GTND-SVX01B-EN
Installation: Piping
hazard, or could be detrimental to the operation of
regulators, relief valves, or other equipment:
• Unit sizes 30–120: Refer to Figure 23, p. 28,
• Unit sizes 150–400: Refer to Figure 26, p. 28.
• All unit sizes: Refer to Figure 28, p. 30 and Figure 30,
p. 31.
• Unit sizes 30–120: Use 4” (120 mm) flue pipe.
• Unit sizes 150–400: Refer to Table 2, p. 14.
All heaters must be vented with a single or double wall
pipe listed for Category III positive pressure vent
systems.
Unit sizes 30–120: Double wall pipe can be used with
limitations as shown in Figure X. As illustrated, a single
5 foot (1.52 m) section of double wall vent pipe with a
draft hood connector may be used between the
appliance vent connection and the vent terminal.
2. Each unit must have an individual vent pipe and
vent terminal! Unit MUST NOT be connected to other
vent systems or to a chimney.
3. The maximum equivalent length of vent pipe must not
be exceeded:
• Unit sizes 30–120: Category III units are limited to a
maximum of 40 feet (12.19 m) equivalent length of
vent pipe; equivalent length is the total length of
straight sections PLUS 5 feet (1.5 m) for each 90°
elbow and 2.5 feet (0.75 m) for each 45° elbow.
• Unit sizes 150–400: The vent pipe equivalent length
must not exceed 50 feet (15.2 m); equivalent length
is the total length of straight sections PLUS 15 feet
(4.6 m) for each 90° elbow and 8 feet (2.44 m) for
each 45° elbow.
4. Seal all vent pipe joins and seams to prevent leakage.
Use General Electric RTV-108, Dow-Corning RTV-732,
or equivalent silicone sealant with a temperature
rating of 500°F (see Figure 25, p. 28). Attach the draft
hood connector to the appliance vent connection with
screws (3 minimum) and seal the joint with silicone
sealant. Install a vent thimble in the wall. Insert the vent
pipe through the thimble and attach it to the adapter on
the appliance. Seal the joint with silicone sealant or
two wraps of aluminum foil tape. Install a vent cap on
the outlet pipe and secure with screws (3 minimum).
Unit sizes 30–120: If using a single section of double
wall vent pipe, seal the annular space between the
inner and outer sections of the draft hood connector
with a high temperature silicone sealant.
5. A vent cap must be supplied by the customer for each
power vented unit:
Unit sizes 30–120: Use an Amerivent Americap or
Metalbestos vent cap. The vent pipe diameter must be
4”.
Unit sizes 150–400: Use a Breidert Type L, Fields
Starkap, or equivalent vent cap. The the vent pipe
diameter must be as specified in Table 2, p. 14. These
unit sizes are factory equipped with the required flue
size collar; attach in place (if not mounted to outlet);
refer to included vent collar instruction sheet for
additional requirements.
6. Through the wall venting for these appliances shall not
terminate over public walkways, or over an area where
the condensate or vapor could create a nuisance,
GTND-SVX01B-EN
7.
The venting system for these appliances shall
terminate at least 4 feet (1.2 m) below, 4 feet (1.2 m)
horizontal from, or 1 foot (0.3 m) above any door,
window, or gravity vent air inlet into the building.
8. Vent terminal:
Unit sizes 30–120: The vent terminal must be installed
with a minimum horizontal clearance of 4 feet (1.2 m)
from electrical meters, gas meters, regulators, and
relief equipment.
Unit sizes 150–400: The vent terminal must be at least
3 feet (1 m) above grade, or in snow areas, at least
3 feet above the snow line to prevent blockage by
snow.
9. The vent terminal must be at least 12 inches (305 mm)
from the exterior of the wall that it passes through to
prevent degradation of the building materials by flue
gasses.
10. Unit sizes 150–400: The vent terminal must be installed
with a minimum horizontal clearance of 4 feet (1.2 m)
from electric meters, gas meters, regulators, and relief
equipment.
11. Maintain clearance between the vent pipe and
combustible materials according to vent pipe
manufacturer’s instructions.
12. Seal all vent pipe joints and seams to prevent leakage.
Use General Electric RTV-108, Dow-Corning RTV-732,
or equivalent silicone sealant with a temperature
rating of 500°F, or 3M #425 aluminum foil tape (or
equivalent). The vent system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inch per foot (21 mm per meter)
toward the outlet for condensate drainage.
Unit sizes 30–120: Install a tee with a condensate drain
at the low point of the pipe (see Figure 23, p. 28). As an
alternate, a 3/8 inch diameter hole may be drilled at the
low point of the pipe for condensate drainage.
13. Horizontal portions of the venting system shall be
supported at minimum intervals of 4 feet (1.2 m) to
prevent sagging (in Canada, support at 3 foot (1 m)
minimum intervals).
14. Insulate pipe where appropriate:
• Unit sizes 30–120: Avoid running vent pipe through
unheated spaces; when this cannot be avoided,
insulate the pipe to prevent condensation of
moisture on the walls of the pipe. Insulate vent pipe
runs longer than 10 feet (3 m). Insulation should be
a minimum of 1/2 inch (12.7 mm) thick foil-faced.
27
Installation: Piping
• Unit sizes 150–400: Insulate single wall vent pipe
exposed to cold air or running through unheated
areas.
Figure 26. Unit sizes 150–400: Horizontally-vented
tubular unit heater (Category III)
Figure 23. Unit sizes 30–120: Horizontal venting
requirements using single wall vent pipe
(Category III)
Unit Sizes 30–120 Only: Vertically Vented
Unit Heaters (Category III)
Figure 24. Unit sizes 30–120: Horizontal venting
requirements using double wall vent pipe
(Category III)
WARNING
Carbon Monoxide!
Never operate unit heaters without combustion air and
flue gas piping in place. Each unit heater MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. Your
venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! Failure to follow these recommendations could
result in death or serious injury.
Figure 25. Unit sizes 30–120: Type B draft hood
connector
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue connection(s)
on the gas unit heater, 4” (102 mm). All heaters must
be vented with a single or double wall pipe listed for
positive pressure vent systems.
2. Each unit must have an individual vent pipe and vent
terminal. Unit MUST NOT be connected to other vent
systems or to a chimney.
3. Category III units are limited to a maximum of 40 feet
(12.19 m) equivalent length of vent pipe. Equivalent
length is the total length of straight sections PLUS
5 feet (1.5 m) for each 90° elbow and 2.5 feet (0.75 m)
for each 45° elbow.
4. The top of the vent pipe should extend at least 2 feet
(0.61 m) above the highest point on the roof.
Consideration should be made for anticipated snow
depth. Install an Amerivent Americap or Metalbestos
vent cap over the vent opening. Slope horizontal runs
upward from the gas unit heater at least 1/4-inch per
foot (21 mm/m) minimum. Horizontal portions of the
venting system shall be supported at minimum
intervals of 4 feet (1.2 m); in Canada, support at 3 feet
(1 m) minimum intervals: see Figure 27, p. 29,
Figure 29, p. 30, and Figure 31, p. 31.
5. Seal all vent pipe joints and seams to prevent leakage.
Use General Electric RTV-108, Dow-Corning RTV-732,
or equivalent silicone sealant with a temperature
28
GTND-SVX01B-EN
Installation: Piping
rating of 500°F, or 3M #425 aluminum foil tape (or
equivalent).
6. Avoid running vent pipe through unheated spaces.
When this cannot be avoided, insulate the pipe to
prevent condensation of moisture on the walls of the
pipe.
Figure 27.
Unit sizes 30–120: Vertical venting
(Category III)
GTND-SVX01B-EN
29
Installation: Piping
Figure 28. All unit sizes: Horizontal arrangement, single wall vent system to single wall termination
Building
overhang
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14
Adjacent
building
Approved
vent cap
(see instructions)
3’-0” min.
(0.9 m min.)
12” min.
(305 mm min.)
To prevent
building material
degradation from
flue gases.
2” min.
(51 mm min.)
all around
6’-0” min.
(1.8 m min.)
Flue
dia.
Flashing
2” clearance
(51 mm)
thimble
Wall
Fiberglass
insulation
min. 2” thick
(51 mm min.)
Pitch flue pipe down toward
outlet 1/4” per foot
(21 mm/m) of run to allow
for condensate drainage
Unit sizes 30–120: 3 feet (0.91 m)
plus maximum snow depth for
area above grade
Unit sizes 150–400: 12 inches
(305 mm) plus maximum snow
depth for area above grade
Figure 29. All unit sizes: Vertical arrangement, single wall vent system to single wall termination
6’-0” min.
(1.8 m min.)
Approved
vent cap
(see instructions)
Adjacent building
Roof pitched
from 0° to 45°
2” min.
(51 mm min.)
all around
30
Fiberglass
insulation
min. 2” thick
(51 mm min.)
Unit sizes 30–120: 2 feet (0.609 m)
plus maximum snow depth for area
Unit sizes 150–400: 6 inches (152 mm)
plus maximum snow depth for area
All unit sizes: Vertical pipe extension
over 12” (305 mm) must be insulated
Roof
Flashing
2” clearance
(51 mm)
thimble
Flue
dia.
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14
GTND-SVX01B-EN
Installation: Piping
Figure 30. All unit sizes: Horizontal arrangement, single wall vent system to double wall termination
Building
overhang
Adjacent
building
Seal joint between single wall vent and double wall vent
and the annular space of the double wall vent
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14
Approved
vent cap
(see instructions)
3’-0” min.
(0.9 m min.)
12” min.
(305 mm min.)
To prevent
building material
degradation from
flue gases.
6’-0” min.
(1.8 m min.)
Flue
dia.
8” to 10”
(203 to 254 mm)
maximum
Wall
Pitch flue pipe down toward
outlet 1/4” per foot
(21 mm/m) of run to allow
for condensate drainage
Flashing
3 feet (0.91 m) plus maximum
snow depth for area above grade
Clearance to be as specified by
vent manufacturer
Figure 31.
All unit sizes: Vertical arrangement, single wall vent system to double wall termination
6’-0” min.
(1.8 m min.)
Approved
vent cap
(see instructions)
Adjacent building
2 feet (0.609 m) plus
maximum snow depth for
area (vertical pip
extension over 12”
[305 mm] must be
insulated)
Roof
Flashing
Roof pitched
from 0° to 45°
8” to 10”
(203 to 254 mm)
maximum
Clearance to be as specified by
vent manufacturer
Flue
dia.
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14
Seal joint between single wall vent and “B”
vent and the annular space of the “B” vent.
GTND-SVX01B-EN
31
Installation: Piping
Separated Combustion
For installations in the United States, vent pipe
approved for Category III appliances must be used
between the appliance and the concentric vent box
unless 33% of the vent run is vertical, then single wall
galvanized vent pipe or double wall Type B vent pipe
may be used between the appliance and the concentric
vent box. A single length of double wall Type B vent
pipe must be used to go through the concentric vent
box and outside wall to the vent terminal.
Unit Sizes 30–120 Only: Category III
Combustion Air Venting and Piping
WARNING
Carbon Monoxide!
Never operate unit heaters without combustion air and
flue gas piping in place. Each unit heater MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. Your
venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! Failure to heed these warnings could result in
death or serious injury.
5. Long runs of single wall combustion air piping passing
through an unheated space may require insulating if
condensation becomes noticeable.
6. The combustion air system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inch per foot toward the inlet cap
to facilitate drainage. Vertical combustion air pipes
should be piped as depicted in Figure 34, p. 34.
7.
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
Never use pipe other than diameter stated in Table 1,
p. 12. To prevent pipe from melting and introducing
exhaust fumes into the air supply, never use PVC, ABS
or any other non-metallic pipe for venting! To prevent
fan restriction, an elbow should never be attached
directly to the venter. Failure to follow
recommendations could result in death or serious
injury or equipment damage.
1. The combustion air system installation must be in
accordance with the current edition of the National
Fuel Gas Code-NFPA 54 or ANSI Z223.1 National Fuel
Gas Code. In Canada, installation must be in
accordance with CAN/CGA-B149.1 “Installation Code
for Natural Gas Burning Appliances and Equipment”
and CAN/CGA-B149.2“ Installation Code for Propane
Burning Appliances and Equipment”.
2. The concentric vent box, inlet air screen, deflector disk,
and vent terminal provided with the unit heater must
be installed at the termination point of the combustion
air/vent system. Refer to Figure 32, p. 33 through
Figure 36, p. 35 and Table 8, p. 33.
3. Each unit heater MUST have its own combustion air
system. It MUST NOT be connected to other air intake
systems.
4. Use single wall pipe constructed of 26 GA galvanized
steel or a material of equivalent durability and
corrosion resistance for the vent system. For
installations in Canada, use corrosion resistant and
gas-tight, listed vent pipe conforming with local
building codes, or in the absence of local building
codes, with current CAN/CGA-B149.1, “Installation
Codes for Natural Gas Burning Appliances and
Equipment” or CAN/CGA-B149.2, “Installation Codes
for Propane Gas Burning Appliances and Equipment”.
32
The equivalent length of the combustion air system
must not be less than 5 feet (1.5 m) and must not
exceed 30 feet (9 m). Equivalent length equals the total
length of straight pipe plus 5 feet (1.5 m) for each 90°
elbow and 2.5 feet (0.76 m) for each 45° elbow.
Note: For optimum performance keep the
combustion air system as straight as possible.
8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M #425
Aluminum Foil Tape or its equivalent must then be
used to seal each joint. General Electric RTV-108, DowCorning RTV-732 or an equivalent silicone sealant with
a temperature rating of 500°F may be used instead of
the tape.
9. For horizontal combustion air systems longer than
5 feet (1.5 m), the system must be supported from
overhead building structures at 4-foot (1.2-m) intervals
in the U.S. and at 3-foot (0.91-m) intervals in Canada.
Exhaust Venting
WARNING
Carbon Monoxide!
Never operate unit heaters without combustion air and
flue gas piping in place. Each unit heater MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. Your
venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! Failure to follow these recommendations could
result in death or serious injury.
Note: Every Separated Combustion unit to be installed
MUST use the factory-supplied Concentric Vent Kit.
If you do not have this kit, contact the manufacturer
ASAP to obtain one prior to installation.
1. Vent system installation must be in accordance with
the current National Fuel Gas Code-NFPA 54 or ANSI
GTND-SVX01B-EN
Installation: Piping
Z223.1 National Fuel Gas Code. In Canada installation
must be in accordance with CAN/CGA-B149.1
“Installation Code for Natural Gas Burning Appliances
and Equipment” and CAN/CGA-B149.2. “Installation
Code for Propane Burning Appliances and Equipment”.
2. The Concentric Vent Kit (which includes a concentric
vent box, air inlet screen, deflector collar, vent terminal
and inlet air collar) provided with the heater by the
manufacturer must be installed at the termination
point of the combustion air/vent system. Refer to
Figure 32, p. 33 through Figure 36, p. 35 and Table 8,
p. 33.
11. The point of termination for a HORIZONTALLY VENTED
exhaust system must be at least 12 inches (0.3 m) from
the exterior of the wall that it passes through. In
addition, the termination point must be at least 1 foot
(0.3 m) above grade or above the snow line, more than
6 feet (1.8 m) from the combustion air inlet of another
appliance, at least 4 feet (1.2 m) below, 4 feet (1.2 m)
horizontally from, or 1 foot (0.3 m) above any door,
window or gravity air inlet into any building, and more
than 3 feet (0.91 m) from and not directly above, any
gas meter or service regulator. Refer to Figure 35,
p. 34, Figure 36, p. 35, and Table 6, p. 24.
3. Each unit heater MUST have its own vent system. It
MUST NOT be connected to other vent systems or to a
chimney.
Table 8.
Unit sizes 30–120: Concentric vent box
dimensions
4. Use flue pipe of the same size as the flue connections
on the gas unit heater (see Table 1, p. 12). All heaters
must be vented with a single or double wall pipe listed
for Category III positive pressure vent systems. A
single length of double wall vent pipe must be used to
go through the concentric vent box and outside wall to
the vent terminal.
Unit Size A
5. The vent system must be installed to prevent collection
of condensate. Pitch horizontal pipes downward 1/
4 inch per foot (21 mm per meter) toward the vent cap
to facilitate drainage. Vertical vent pipes should be
piped as depicted in Figure 34, p. 34.
105
Dimensions—Inches (Nominal)
B
C
D
E
G
4-1/2
4
6
8
5
12
5-1/2
5
8
12
5
15
30
45
60
75
90
120
Figure 32. Unit sizes 30–120: Concentric vent box
6. The equivalent length of the vent system must not be
less than 5 feet (1.5 m) and must not exceed 30 feet
(9 m). The equivalent length equals the total length of
straight pipe plus 5 feet (1.5 m) for each 90° elbow and
2.5 feet (0.76 m) for each 45° elbow.
7.
Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M #425
Aluminum Foil tape or its equivalent must then be
used to seal each joint. High temperature silicone
sealant may be used instead of the tape. Silicone
sealant must be used to seal the joint between the
Type B vent pipe and the single wall pipe.
8. For horizontal vent systems longer than 5 feet (1.5 m),
the system must be supported from overhead building
structures at 4-foot (1.2-m) intervals in the U.S. and at
3-foot (0.91-m) intervals in Canada.
9. The exhaust vent system must remain at a minimum
distance of 1 inch (25 mm) from all combustible
materials. Any part of the vent system that passes
through a combustible material must be properly
insulated.
Note: Increasing the clearance distances may be
necessary if there is a possibility of distortion or
discoloration of adjacent materials.
10. The top of a VERTICALLY VENTED exhaust system
must extend at least 3 feet (0.91 m) above the roof
surface that it passes through (see Figure 34, p. 34).
GTND-SVX01B-EN
33
Installation: Piping
Figure 33. Unit sizes 30–120: Concentric vent
installation
Figure 34. Unit sizes 30–120: Vertical intake/vent installation
Figure 35. Unit sizes 30–120: Horizontal intake/vent
installation
34
GTND-SVX01B-EN
Installation: Piping
Figure 36. Unit sizes 30–120: Horizontal intake/vent
installation
Building Overhang
3'-0" Min.
(0.9M Min.)
Adjacent Building
6'-0" Min.
(1.8M Min.)
Vent Terminal
D 3330
Air Inlet Collar
Remove screen and mounting plate from air inlet on rear
panel of unit by removing 4 screws. Secure inlet collar and
gasket to inlet opening re-using the 4 screws removed in
step one.
underside of the roof using suitable brackets (field
supplied). Before mounting box, cut a length of pipe so
that dimension A, Figure 34, p. 34, is equal to the
dimension from the top of the box to the roof surface plus
20 inches or plus maximum expected snow depth,
whichever is greater:
• Unit sizes 30–75: Cut a length of 6-inch (152-mm) pipe.
• Unit sizes 90–120: Cut a length of 8-inch (203-mm) pipe.
Fasten pipe to combustion air inlet connection of
concentric vent box and seal joint. Insert pipe through roof
and fasten vent box in place. Flash and/or caulk pipe to
roof. Install inlet air screen assembly and fasten to pipe
with screws.
Insert a 5-foot length of Type B vent pipe through the
concentric vent box opening (see Figure 32, p. 33, detail A)
with the “UP” arrow pointing up. Position the pipe to
extend 12 inches beyond the inlet air screen. Secure the
Type B vent pipe in position by drilling three small equally
spaced holes through the collar of the concentric vent box
and inserting sheet metal screws. Install deflector disk on
Type B vent pipe 2-1/2 inches above inlet air screen and
fasten with screws. Seal joint between deflector disk and
pipe with silicone sealant. Install vent terminal on top of
Type B vent pipe, fasten with screws and seal joint.
Unit sizes 90–120: Secure the reducer fitting (to transition
from 5” pipe to 4” pipe) to the flue collar on the rear panel.
Seal per exhaust venting instructions.
Connect flue pipe and combustion air pipe from concentric
vent box to unit, following instructions in “Combustion Air
Venting and Piping,” p. 32 and“Exhaust Venting,” p. 32.
Joint between Type B vent pipe and single wall vent pipe
must be sealed with high temperature silicone sealant (see
Figure 33, p. 34). Collars on unit and on concentric vent
box are sized so that crimped ends of combustion air pipes
go toward the unit and crimped ends of flue pipes go away
from the unit.
Concentric Vent Terminal—Vertical
Termination
Concentric Vent Terminal—Horizontal
Termination
Exhaust Air Collar
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
Never use pipe other than diameter stated in Table 1,
p. 12. To prevent pipe from melting and introducing
exhaust fumes into the air supply, never use PVC, ABS
or any other non-metallic pipe for venting! To prevent
fan restriction, an elbow should never be attached
directly to the venter. Failure to follow
recommendations could result in death or serious
injury or equipment damage.
Select location on roof for vent terminal, ensuring
adequate space inside the building/structure for
concentric vent box. Terminal must be at least 6 feet
(1.8 m) from any wall or adjoining building (see Figure 34,
p. 34).
Cut a hole through the roof for combustion air pipe.
Concentric vent box is to be suspended from the
GTND-SVX01B-EN
Select a location on outside wall for vent terminal. In most
applications, the terminal should be on level with the flue
outlet of the unit less a 1/4 inch per foot pitch for
condensate drainage toward the outside of the building
(see Figure 35, p. 34).
The location of the vent terminal must be in accordance
with the National Fuel Gas Code ANSI Z223.1 in the U.S. or
the Natural Gas Installation Code CAN/CGA-B149.1 or the
Propane Gas Installation Code CAN/CGA-149.2 in Canada.
Refer to Table 6, p. 24 for minimum. In Canada, a vent shall
not terminate above a meter/regulator assembly within
3 feet (0.9 m) horizontally of the vertical centerline of the
regulator nor within 6 feet (1.8 m) of any gas service
regulator vent outlet.
Cut a hole through the wall for a combustion air pipe:
• Unit sizes 30–75: Cut for a 6-inch (152-mm) combustion
air pipe.
• Unit sizes 90–120: Cut for an 8-inch (203-mm)
combustion air pipe.
35
Installation: Piping
Install thimble if required by local codes or type of wall
construction. Concentric vent box may be fastened
directly to wall or spaced away from wall using suitable
brackets (field supplied). Cut a length of pipe so that it will
protrude 4 inches (102 mm) through the wall when the box
is mounted in position. Fasten pipe to box with sheet metal
screws, using at least three screws per joint. Seal joint with
silicone sealant. Insert pipe through wall and fasten
adapter box in place so that the pipe pitches downward 1/
4 inch per foot (21 mm/m) toward the outside. Flash and/
or caulk pipe on outside wall. Install inlet air screen
assembly and fasten to pipe with screws. Insert a 3-foot
length of Type B vent pipe through the concentric vent box
opening (see Figure 32, p. 33, detail A) with the “UP”
arrow pointing toward the outside:
• Unit sizes 30–75: Insert a 3-foot length of 4-inch Type B
vent pipe
• Unit sizes 90–120: Insert a 3-foot length of 5-inch Type B
vent pipe.
Position the pipe to extend 12 inches beyond the inlet air
screen. Secure the Type B vent pipe in position by drilling
three small equally spaced holes through the collar of the
concentric vent box and inserting sheet metal screws.
Install deflector disk on Type B vent pipe 2-1/2 inches
(63.5 mm) from inlet air screen and fasten with screws.
Install vent terminal on end of Type B vent pipe, fasten
with screws and seal joint.
Connect flue pipe and combustion air pipe from concentric
vent box to unit, following instructions “Combustion Air
Venting and Piping,” p. 32 and“Exhaust Venting,” p. 32.
Joint between Type B vent pipe and single wall vent pipe
must be sealed with high temperature silicone sealant (see
Figure 33, p. 34). Collars on unit and on concentric vent
box are sized so that crimped ends of combustion air pipes
go toward the unit and crimped ends of flue pipes go away
from the unit.
36
GTND-SVX01B-EN
Installation: Electrical
Electrical Connections
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. When possible, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
WARNING
Hazardous Voltage and Gas!
Turn off the gas supply and disconnect all electric
power, including remote disconnects before servicing
unit. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized
and the gas can not be inadvertently turned on. Failure
to turn off gas or disconnect power before servicing
could result in death or serious injury.
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE & ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow these requirements could result in death or
serious injury.
NOTICE:
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors could
result in equipment damage.
It is recommended that the electrical power supply to each
unit heater be provided by a separate, fused, and
permanently live electrical circuit. A disconnect switch of
suitable electrical rating for each unit heater should be
located as close to the gas valve and controls as possible.
Each unit heater must be electrically grounded in
accordance with the latest edition of the National Electric
Code, ANSI/NFPA No. 70 or CSA Standard C22.1. See
sample wiring connections:
• All unit sizes: Refer to Figure 37, p. 37 through
Figure 39, p. 38 and Figure 42, p. 50.
• Unit sizes 30–120: Also refer to Figure 43, p. 51 through
Figure 44, p. 51.
• Unit sizes 150–400: Also refer to Figure 45, p. 52 and
Figure 46, p. 52.
Thermostat Wiring and Location
Note: The thermostat must be mounted on a vertical,
vibration-free surface, free from air currents, and in
accordance with the furnished instructions.
Mount the thermostat approximately 5 feet (1.5 m) above
the floor in an area where it will be exposed to a free
circulation of average temperature air. Always refer to the
thermostat instructions as well as our unit wiring diagram,
and wire accordingly. Avoid mounting the thermostat in
the following locations:
1. Cold areas—Outside walls or areas where drafts may
affect the operation of the control.
2. Hot areas—Areas where the sun’s rays, radiation, or
warm air currents may affect control operation.
3. Dead areas—Areas where air cannot circulate freely,
such as behind doors or in corners.
Figure 37.
All unit sizes: Low-voltage thermostat wiring
(Single stage)
Standard units are shipped for use on 115 volt, 60 hertz
single phase electric power. The motor nameplate and
electrical rating of the transformer should be checked
before energizing the unit heater electrical system. All
external wiring must conform to the latest edition of ANSI/
NFPA No. 70 National Electrical Code and applicable local
codes; in Canada, to the Canadian Electrical Code, Part 1
CSA Standard C22.1.
GTND-SVX01B-EN
37
Installation: Electrical
Figure 38. All unit sizes: Low-voltage thermostat wiring
(Two stage)
Figure 39. All unit sizes: T834H or T843N Thermostat
wiring
W
R
R
G W1 W2
G
D6922C
Thermostat Heat Anticipator Adjustments. The
initial heat anticipator setpoint should equal the
thermostat’s current amperage draw when the unit is
firing. This setpoint should be measured for the best
results. Use the recommended ranges as a guide. If further
information is needed, consult your thermostat
manufacturer’s instructions.
Recommended Heat Anticipator Settings:
Unit Size:
For Tubular Units:
30–200
0.35 Amps
250–400
0.65 Amps
Note: Should any high limit wires have to be replaced,
they must be replaced with wiring material having
a temperature rating of 200°C minimum.
38
GTND-SVX01B-EN
Start-Up
All Unit Sizes: Operation
Power Vented Propeller Units—Direct
Spark Ignition
Explanation of Controls
WARNING
Carbon Monoxide!
Never operate unit heaters if the power venter is not
operable. Your venting system must not be blocked by
any snow, snow drifts, or any foreign matter. Inspect
your venting system to ensure adequate ventilation
exists at all times! Failure to follow these
recommendations could result in death or serious
injury due to Carbon Monoxide Poisoning (symptoms
include grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms).
Note: Refer to figures:
• Unit sizes 30–120: Refer to Figure 40, p. 40.
• Unit sizes 150–400: Refer to Figure 41, p. 40.
1. Each Unit Heater comes equipped with a power vent
system that consists of a power venter motor and
blower, pressure switch, and sealed flue collector in
place of the conventional draft diverter.
2. The power venter motor is energized by the room
thermostat through the integrated control board when
a demand for heat is sensed. The pressure switch
measures the flow through the vent system and
energizes the direct spark ignition system beginning
the pre-purge timing when the flow is correct.
3. The direct spark ignition system consists of an ignition
control module and a gas valve. When the pre-purge
period ends, the spark ignition system is energized,
and the gas valve opens to supply gas to the burner.
Once the thermostat has been satisfied, the vent
system is de-energized, stopping all gas flow to the
unit.
4. The limit switch interrupts the flow of electric current to
the control board, interrupting the flow of gas to the
gas valve if the unit heater becomes overheated.
WARNING
Flame Roll-Out Hazard!
Flame roll-out can cause fire! The flame roll-out switch
trips in events in which flame extends beyond the
combustion chamber. When the flame roll-out switch
trips, it interrupts the flow of electric current to the
control board, interrupting the flow of gas to the unit
heater in the event of sustained flame roll-out from the
burner area. If the flame roll-out switch trips, you must
determine and correct the cause of the flame roll-out
before starting the unit back up. Failure to do so could
result in death or serious injury.
5. Once the thermostat is satisfied, or the limit switch
interrupts the flow of electric current to the control
board, the unit will begin a post-purge period. When
the post-purge period ends, the power venter motor is
de-energized.
6. The operation of the fan is delayed for approximately
30 seconds once the thermostat is closed, and
continues operation for approximately 30 seconds
after the thermostat opens.
Note: The start-up fan delay must not exceed 30
seconds from a cold start.
7.
The wall thermostat, supplied optionally, is a
temperature sensitive switch that operates the vent
and ignition systems to control the temperature of the
space being heated.
Note: The thermostat must be mounted on a vertical,
vibration-free surface, free from air currents,
and in accordance with the furnished
instructions.
Start-Up (also refer to lighting instruction
plate equipped on the unit)
1. Open the manual gas valve, in the gas supply line to the
unit heater with union connection loose, purge air
from the gas line. Tighten the union and check for
leaks.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Before attempting
to light or relight the pilot, wait 5 minutes to allow gas
which may have accumulated in the burner
compartment to escape. Failure to follow
recommended safe leak test procedures or pilot
lighting/relighting instructions could result in death or
serious injury or equipment or property-only-damage.
2. Open the manual valve on the unit heater.
GTND-SVX01B-EN
39
Start-Up
3. Turn on the electrical power. The unit heater should
now be under the control of the thermostat. Set the
thermostat to its highest setting; the power venter
motor should start and burner ignition occur. Turn the
thermostat to its lowest setting; the power venter
motor shuts off and the burner(s) should extinguish.
Reset the thermostat to the desired operational setting.
Note: For more information, refer to “Gas Input Rate,”
p. 40 and “Gas Pressure Adjustments,” p. 40.
Shut-Down
1. Turn the valve selector knob to the OFF position.
Gas Input Rate
2. Turn off the electricity.
3. To relight, follow the instructions in “Start-Up (also
refer to lighting instruction plate equipped on the
unit),” p. 39 (preceding section).
Refer to the figures for parts/identification:
• All unit sizes: Refer to Figure 2, p. 8.
• Unit sizes 30–120: Also refer to Figure 3, p. 9 through
Figure 6, p. 10 and Figure 40, p. 40.
• Unit sizes 150–400: Also refer to Figure 7, p. 10 through
Figure 12, p. 11 and Figure 41, p. 40.
Figure 40. Unit sizes 30–120: Burner parts/identification
NOTICE:
Overfiring!
Never overfire the unit heater, as this could cause
unsatisfactory operation, or shorten the life of the
heater.
Check the gas input rate as follows (refer to “General
Safety Information,” p. 7 for metric conversions):
1. Turn off all gas appliances that utilize gas the same
meter as the unit heater.
2. Turn gas on to the unit heater.
3. Using the gas meter, clock the time that it takes to burn
one cubic foot of gas (Heating Value).
4. Insert the time, in seconds, into the formula below:
Input Rate =
Heating Value (Btu/ft3) (3600 s/hr)
Time (s/ft3)
Example: If the heating value = 1000 BTU/ft3 and the time/
ft3 = 48 s/ft3 then
Input Rate =
(1000 BTU/ft3) (3600 s/hr)
48 s/ft3
Input Rate = 75,000 BTU/hr
(Refer to “General Safety Information,” p. 7 for metric
conversions.)
Figure 41.
Unit sizes 150–400: Burner parts/
identification
Note: If the computation exceeds, or is less than 95
percent of the gas Btu/h input rating, adjust the gas
pressure:
• Unit sizes 30–120: Refer to Table 1, p. 12.
• Unit sizes 150–400: Refer to Table 2, p. 14.
Gas Pressure Adjustments
Adjust the gas pressure as follows:
1. NATURAL GAS: Best results are obtained when the
heater is operating at its full input rating with the
manifold pressure of 3.5 inches wc (0.9 kPa).
Adjustment of the pressure regulator is not normally
necessary since it is preset at the factory.
However, field adjustment may be made as follows:
Primary Air Adjustment
Primary air adjustment is made at the factory. No field
adjustments are necessary.
40
a. Attach manometer at pressure tap plug:
• Unit sizes 30–120: The pressure tap plug is below
the control outlet.
• Unit sizes 150–400: the pressure tap plug is
adjacent to the control outlet.
GTND-SVX01B-EN
Start-Up
b. Remove the regulator adjustment screw cap,
located on the combination gas valve.
c. With a small screwdriver, rotate the adjustment
screw counterclockwise to decrease or clockwise to
increase pressure.
d. Replace regulator adjustment screw cap.
2. PROPANE GAS: An exact manifold pressure of
10.0 inches wc (2.5 kPa) must be maintained for proper
operation of the heater. If the unit is equipped with a
pressure regulator on the combination gas valve,
follow Step a through Step d (above). If the unit is not
so equipped, the propane gas supply system pressure
must be regulated to attain this manifold operating
pressure.
3. The adjusted manifold pressure should not vary more
than 10 percent from the pressure specified in Table 9,
p. 41 and Table 10, p. 42.
Table 9.
All unit sizes: Main burner orifice schedule(a)
Type of Gas Natural
Heating
Value
Input in
1000
Manifold
BTU(a) Pressure
30
45
60
75
90
105
120
150
175
200
250
300
350
400
1075 BTU/ft3
(40.1 MJ/m3)
3.5” wc (0.9 kPA)
Propane
2500 BTU/ft3
(93.1 MJ/m3)
10” wc (2.5 kPA)
No. of
Burner
Orifices
1
ft3/hr
28
12
Orifice Drill
38
52
ft3/hr
42
18
Orifice Drill
31
48
ft3/hr
56
24
Orifice Drill
27
43
ft3/hr
70
30
Orifice Drill
20
40
ft3/hr
84
36
Orifice Drill
16
36
ft3/hr
98
42
Orifice Drill
11
32
ft3/hr
112
48
Orifice Drill
6
3.1 mm
ft3/hr
140
60
Orifice Drill
42
53
ft3/hr
163
70
Orifice Drill
42
53
ft3/hr
186
80
Orifice Drill
42
53
ft3/hr
233
100
Orifice Drill
42
53
ft3/hr
280
120
Orifice Drill
42
53
ft3/hr
326
140
Orifice Drill
42
53
ft3/hr
372
160
Orifice Drill
42
53
1
1
1
1
1
1
6
7
8
10
12
14
16
Note: When installed in Canada, any references to deration at altitudes in
excess of 2000 feet (610 m) are to be ignored. At altitudes of 2000
to 4500 feet (610 to 1372 m), the unit heaters must be orificed to
90 percent of the normal altitude rating, and be so marked in
accordance with the ETL certification.
(a) This schedule is for units operating at normal altitudes of 2000 feet
(610 m) or less. SPECIAL ORIFICES ARE REQUIRED FOR INSTALLATIONS ABOVE 2,000 FEET (610 m).
Tubular Unit Heater High Altitude Deration
This tubular unit heater has been manufactured utilizing
standard burner orifices and a normal manifold pressure
setting as per the specifications shown on the unit rating
plate (see Table 4, p. 23, Table 9, p. 41, and Table 10, p. 42).
All unit deration must be done through field adjustments
by a qualified technician (see Table 10, p. 42). Once the
proper adjustments are made in the field, attach label
#J17-06459 to the unit, and record adjusted manifold
pressure, altitude of the unit installation and the
technician’s name and date on the label using a permanent
marker.
GTND-SVX01B-EN
41
Start-Up
Table 10. All unit sizes: Tubular unit heater high altitude
manifold pressure
Natural Gas
Propane (LP) Gas
Manifold Pressure
(in. wc)
Manifold
Pressure (in. wc)
Heating(a
Heating(a)
Unit Sizes
Unit Sizes
) Value
Value
Altitude
(Btu/ ft3) 30–120 150–400 (Btu/ ft3) 30–120 150–400
(ft)
2,000
948
3.5
3.5
2,278
10.0
8.6
2,500
931
3.5
3.5
2,237
10.0
8.5
3,000
914
3.5
3.3
2,196
10.0
8.4
3,500
897
3.4
3.2
2,156
10.0
8.4
4,000
881
3.4
3.2
2,116
10.0
8.3
4,500
865
3.4
3.2
2,077
9.9
8.2
5,000
849
3.3
3.1
2,039
9.7
8.1
5,500
833
3.3
3.1
2,000
9.6
8.0
6,000
818
3.2
3.0
1,964
9.5
7.9
6,500
802
3.2
3.0
1,927
9.3
7.7
7,000
787
3.1
2.9
1,891
9.2
7.6
7,500
771
3.1
2.9
1,853
9.0
7.5
8,000
756
3.1
2.8
1,817
8.9
7.4
8,500
741
3.0
2.8
1,781
8.7
7.2
9,000
726
2.9
2.7
1,745
8.5
7.1
9,500
711
2.9
2.7
1,709
8.3
6.9
10,000
696
2.8
2.6
1,673
8.1
6.8
(a)Consult local utility for actual heating value. Table based on heating value of 1,050 Btu/ft3 at sea level.
42
GTND-SVX01B-EN
Start-Up
Gas Equipment Start-Up
Customer _____________________________________________
Job Name & Number _________________________
Pre-Inspection Information with Power and Gas Off
Type of Equip:
Unit Heater
Serial Number: _________________________
Model Number: _____________________________
Name Plate Voltage: ____________________
Name Plate Amperage: ______________________
Type of Gas:
Tank Capacity:
Natural
LP
_______ lb
Rating:
_______ kg
_______ Btu @ ____ °F
________ kW @ ____ °C

Are all panels, doors, vent caps in place?

Has the unit suffered any external damage?

Does the gas piping and electric wiring appear to be installed in a professional manner?

Has the gas and electric been inspected by the local authority having jurisdiction?

Is the gas supply properly sized for the equipment?

Were the installation instructions followed when the equipment was installed?

Have all field installed controls been installed?

Do you understand all the controls on this equipment? If not, contact your wholesaler or rep. (DO NOT START
this equipment unless you fully understand the controls.)
Damage ______________________________
GENERAL
With power and gas off.
GAS HEATING
With power and gas on.

Make certain all packing has been removed.

Inlet gas pressure. ____ in. wc or ____ kPa

Tighten all electrical terminals and connections.

Burner ignition.

Check damper linkages for tightness.

Manifold gas pressure. ____ in. wc or ____ kPa

Check all fans and blowers for free movement.

Cycle firestat and/or freezestat.

Check all controls for proper settings.

Check electronic modulation. Set at: __________

Cycle and check all other controls not listed.

Check operation of remote panel.

Entering air temp. _____ °F or ____ °C

Discharge air temp. (high fire) ____ °F. or ____ °C

External static pressure _________ in. wc

Cycle by thermostat or operating control.
Remarks: _____________________________________________________________________________________________________
_______________________________________________________________________________________________________________
_______________________________________________________________________________________________________________
GTND-SVX01B-EN
43
Maintenance
•
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could
result in exposure to electrical, mechanical or other
potential safety hazards. Always refer to the safety
warnings provided throughout this manual concerning
these procedures. When possible, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks. Failure to follow all of the recommended safety
warnings provided, could result in death or serious
injury.
Periodic Service
All Maintenance/Service information should be recorded
accordingly on the inspection sheet provided in this
manual (see “Gas Equipment Start-Up,” p. 43).
Note: The heater and vent system should be checked
once a year by a qualified technician.
WARNING
Hazardous Voltage and Gas!
Turn off the gas supply and disconnect all electric
power, including remote disconnects before servicing
unit. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized
and the gas can not be inadvertently turned on. Failure
to turn off gas or disconnect power before servicing
could result in death or serious injury.
Important:
Gas tightness of the safety shut-off valves
must be checked on at least an annual basis.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Failure to follow
recommended safe leak test procedures could result in
death or serious injury or equipment or property-onlydamage.
To check gas tightness of the safety shut-off valves, turn off
the manual valve upstream of the appliance combination
control. Remove the plug on the inlet side of the
combination control and connect a manometer to that
tapping:
• Unit sizes 30–120: The plug is 3/32-hex head.
44
Unit sizes 150–400: The plug is a 1/8-inch pipe plug.
Turn the manual valve on to apply pressure to the
combination control. Note the pressure reading on the
manometer, then turn the valve off. A loss of pressure
indicates a leak. If a leak is detected, use a soap solution to
check all threaded connections. If no leak is found,
combination control is faulty and must be replaced before
putting appliance back in service.
Should maintenance be required, perform the following
inspection and service routine:
1. Inspect the area near the unit to be sure that there is no
combustible material located within the minimum
clearance requirements listed in this manual.
WARNING
Combustible Materials!
Maintain proper clearance between the unit heat
exchanger, vent surfaces and combustible materials.
Refer to unit nameplate and installation instructions for
proper clearances. Improper clearances could result in a
fire hazard. Failure to maintain proper clearances could
result in death or serious injury or property damage.
2. Turn off the manual gas valve and electrical power to
the unit heater.
3. Unit sizes 30–120: Remove service access panel.
4. To clean or replace the main burner(s):
• Unit sizes 30–120: Remove retainer from around
manifold orifice, disconnect flame sensor and
igniter from control board, remove burner
assembly mounting screws (see Figure 3, p. 9).
• Unit sizes 150–400: Remove burner cover. Remove
top strip from above burners. Lift burners up and
pull away from manifold to remove.
5. With the burner(s) removed, wire brush the inside
surfaces of the heat exchanger.
6. Remove any dirt, dust, or other foreign matter from the
burner(s) using a wire brush and/or compressed air.
Ensure that all parts are unobstructed.
7.
Reassemble the unit heater by replacing all parts in
reverse order.
8. Unit sizes 150–400: Complete the appropriate unit
start-up procedure as given in “All Unit Sizes:
Operation,” p. 39 of this manual (see unit lighting
instruction plate and the unit nameplate).
9. Check the burner adjustment.
10. Check all gas control valves and pipe connections for
leaks.
11. Check the operation of the automatic gas valve by
lowering the setting of the thermostat, stopping the
operation of the gas unit heater. The gas valve should
GTND-SVX01B-EN
Maintenance
close tightly, completely extinguishing the flame on
the main burner(s).
12. Inspect and service the motor/fan assemblies. To
maintain efficient air flow, inspect and clean the fan
blades and guard to prevent buildup of foreign matter.
13. Check lubrication instructions on the motor. If oiling is
required, add 3 to 4 drops of electric motor oil as
follows:
a. Light Duty—After 3 years or 25,000 hours of
operation.
b. Average Duty—Annually after 3 years or
8,000 hours of operation.
c. Heavy Duty—Annually after 1 year or at least
1,500 hours of operation.
14. Check and test the operational functions of all safety
devices supplied with your unit.
How to Order Replacement Parts
Please send the following information to your local Parts
center; If further assistance is needed, contact the
manufacturer’s customer service department.
•
Model number
•
Serial Number
•
Part description and Number as shown in the
Replacement Parts Catalog.
GTND-SVX01B-EN
45
Diagnostics
Troubleshooting
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. When possible, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
Table 11.
Troubleshooting guide
Symptoms
Possible Cause(s)
Corrective Action
A.
Flame pops back.
1.
Burner orifice incorrect.
1.
2.
Low manifold pressure.
2.
Test and reset manifold pressure.
B.
Noisy flame.
1.
Irregular orifice causing whistle or
resonance.
1.
Replace orifice.
2.
Excessive gas input.
2.
Test and reset manifold pressure.
C.
Yellow tip flame (some yellow
tipping on propane gas is
permissible).
1.
Clogged burner(s).
1.
Clean main burner ports.
2.
Misaligned orifice(s).
2.
Align manifold assembly.
Clean flue. Refer to “Installation: Piping,” p. 21.
D. Floating flame.
E.
F.
46
Gas Odor.
Delayed ignition.
Check for proper orifice size. Refer to “All Unit Sizes:
Operation,” p. 39.
1.
Blocked venting.
1.
2.
Insufficient combustion air.
2.
Clean combustion air inlet openings.
3.
Blocked heat exchanger.
3.
Clean heat exchanger. Refer to “Installation: Mechanical,”
p. 16.
4.
Air leak into combustion chamber,
flue collector, or draft hood.
4.
Determine cause and repair accordingly.
1.
Inspect all gas piping and repair.
1. Shut off gas supply
immediately!
2.
Leaking gas test port on valve.
2.
Check to ensure gas test ports are seated.
3.
Blocked heat exchanger.
3.
Clean heat exchanger/flue.
4.
Negative pressure in building.
4.
See “Installation: Piping,” p. 21.
5.
Blocked flue collector and/or draft
hood.
5.
Clean flue collector and/or draft hood.
1.
Improper ground.
1.
Check grounding wires and spark bracket connections.
2.
Bad or broken spark cable.
2.
Inspect spark cable connections and cuts.
3.
Faulty control.
3.
Check to ensure spark is energized after pre purge period.
4.
Manifold pressure set too low.
4.
Test and reset manifold pressure. Refer to “All Unit Sizes:
Operation,” p. 39.
5.
Main burner orifice(s) dirty.
5.
Clean or replace orifice(s).
6.
Improper venting.
6.
Refer to “Installation: Piping,” p. 21.
GTND-SVX01B-EN
Diagnostics
Table 11.
Troubleshooting guide (continued)
Symptoms
Possible Cause(s)
Corrective Action
G. Failure to ignite.
1.
Gas supply is off.
1.
Open all manual gas valves. Check for leaks.
2.
Lack of power at unit.
2.
Replace fuse or turn on power supply.
3.
Thermostat not calling for heat.
3.
Turn up thermostat. Check for 24 volts at terminals “R” and
“W1” on terminal strip.
4.
Defective high limit.
4.
Check limit switch with continuity tester. If open with no
heat present, replace limit switch.
5.
Defective drafter prove switch.
5.
Check switch operation to ensure switch closes after drafter
purge period. If it does not, make/check tubing
connections/blockage.
6.
Improper ground.
6.
Check all ground wires and connections.
7.
Improper thermostat or
transformer wiring.
7.
Check wiring per diagrams.
8.
Ignitor defective/damaged.
8.
Replace ignitor.
9.
Misaligned ignitor.
9.
Realign ignitor.
10. Defective gas valve.
H. Condensation of water vapor.
I.
J.
K.
L.
Burner(s) won't turn off.
Rapid burner cycling.
Noisy power venter.
Fan will not run.
M. Fan motor turns on and off while
burner is operating.
GTND-SVX01B-EN
10. Check for 24 volts at gas valve terminals during trial for
ignition period. If present with no manifold pressure,
replace gas valve.
11. Loose wiring.
11. Check and tighten all wiring connections per diagrams.
12. Blown fuse.
12. Refer to symptom Q.
1.
Improper venting.
1.
Refer to “Installation: Venting,” p. 23.
2.
Unit under-fired.
2.
Check gas supply pressures to unit. Refer to “Installation:
Mechanical,” p. 16.
3.
Building too cold.
3.
Refer to “Installation: Mechanical,” p. 16.
1.
Poor thermostat location.
1.
Relocate thermostat away from outside walls or drafts.
2.
Improper thermostat wiring at gas
valve.
2.
Check thermostat circuit for open and close on terminal strip
on heater “R” and “W”.
3.
Short circuit.
3.
Check thermostat circuit for short (such as staples piercing
thermostat wiring), and correct.
4.
Defective or sticking gas valve.
4.
Check for 24V at gas valve terminals when thermostat is not
calling.
5.
Excessive gas supply pressure.
5.
Refer to “Installation: Piping,” p. 21.
1.
Loose electrical connections at gas
valve or thermostat.
1.
Tighten all electrical connections.
2.
Excessive thermostat heat
anticipator setting.
2.
Adjust thermostat heat anticipator for longer cycles. Refer
to “Installation: Electrical,” p. 37.
3.
Unit cycling on high limit.
3.
Check for proper air supply across heat exchanger and
proper gas supply.
4.
Poor thermostat location.
4.
Relocate thermostat.
1.
Power venter wheel loose.
1.
Replace or tighten.
2.
Power venter wheel dirty.
2.
Clean power venter wheel.
3.
Power venter wheel
3.
Realign power venter wheel.
1.
Loose electrical connections.
1.
Check and tighten wires on fan circuit.
2.
Defective motor or overload.
2.
Test for 115V at terminal ACB Heat and “L2”. If voltage is
present, replace motor.
3.
Defective control board.
3.
Test for 115V at terminal ACB Heat and “L2” on the control
board. If voltage is not present 45 seconds after trial for
ignition, replace board.
4.
Blown fuse.
4.
Replace fuse.
1.
Motor overload protection is
tripping.
1.
Check motor amps against motor name plate, and check
voltage. Replace if found defective.
2.
Loose wiring or connection.
2.
Check for 115V between motor leads.
3.
Control board is defective.
3.
Check terminal ACB Heat for voltage. If voltage is not
constant, replace board.
47
Diagnostics
Table 11.
Troubleshooting guide (continued)
Symptoms
Possible Cause(s)
Corrective Action
N. Fan will not stop.
1.
Control board is in flame failure
mode.
1.
Turn 115V power off to the unit, wait 10 seconds, and
reapply voltage to the unit.
2.
Fan improperly wired.
2.
Check wiring of fan circuit per wiring diagram.
3.
Defective board.
3.
If unit is not calling for heat and board is not in a flash code
mode, replace board.
1.
Incorrect gas input.
1.
Refer to “All Unit Sizes: Operation,” p. 39.
2.
Heater undersized.
2.
Is the heater output sized correctly for the heat loss of the
space? Has the space been enlarged?
3.
Thermostat malfunction.
3.
Check thermostat circuit, 24V at terminals “R” and “W” on
terminal strip.
4.
Heater cycling on limit.
4.
Check air movement across heat exchanger. Check voltage
and amps to fan motor. Check gas input to ensure unit is
not over-fired. Check heat exchanger to ensure unit is not
dirty.
5.
Incorrect orifice size(s).
5.
Check orifice size; replace if undersized.
1.
Unit is over-fired.
1.
Refer to “All Unit Sizes: Operation,” p. 39. Check orifice size;
if too big, replace.
2.
Thermostat malfunction.
2.
Check thermostat for operation, to ensure circuit opens and
closes.
3.
Heater runs continuously.
3.
Check wiring per diagrams; check operation at gas valve.
Look for short (such as staples piercing thermostat wiring)
in thermostat circuit and correct.
1.
Electrical short.
1.
Refer to wiring diagram.
2.
Improper ground.
2.
Check grounding wires.
O. Not enough heat.
P.
Too much heat.
Q. Blown fuse.
3.
Defective gas valve.
3.
Replace.
R.
Cold air is delivered during heater
operation.
1.
Incorrect manifold pressure or
input.
1.
Refer to “All Unit Sizes: Operation,” p. 39.
S.
Hi-Limit switch tripping.
1.
Unit is overfiring.
1.
Burner orifice(s) may be too large: verify/replace if
required.
2.
Air flow too low.
2.
Check for proper voltage. Ensure fan blade is correctly
positioned 1/3 inside venturi.
3.
Defective switch.
3.
Check operation of switch. Did the switch open when unit is
running or is the switch open during start-up?
4.
Defective control board.
4.
Check for 24V on line side of the high limit. Constant voltage
should be recorded; if not, control board is suspect. Check
flash code.
1.
Loose wiring or connections.
1.
Check all wiring in the power vent circuit to ensure good
connection, including “Neutral”.
2.
Motor overload is tripped or bad
motor.
2.
Check for 115V between motor leads and check amp draw
of motor. Replace if needed.
3.
Defective control board.
3.
Check for continuous 115V on terminal “CBM Blower” and
neutral during call for heat. If not present and all checks are
normal, replace.
1.
Power venter improperly wired.
1.
Check power venter circuit per wiring diagram.
2.
Motor overload cycling or
defective motor.
2.
Check motor amps against motor name plate rating, check
voltage; replace motor if defective.
3.
Defective control board.
3.
Check for continuous 115V on terminal “CMB Blower” during
call for heat; replace board if found defective.
1.
Power venter improperly wired.
1.
Check power venter circuit per wiring diagram.
2.
Main burner not lighting while
thermostat calls for heat.
2.
Heater is in lockout mode; check flash code table for
problem.
3.
Defective control board.
3.
No flash codes present along with no call for heat; replace
control board.
4.
Loss of pressure. Pressure switch
not made.
4.
Check venting for blockage. Check tubing for blockage or
hole. Check spud for blockage.
T.
Power venter will not run.
U. Power venter motor turns on and
off while burner is operating.
V.
48
Power venter motor will not stop.
GTND-SVX01B-EN
Diagnostics
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
1. Check the system thermostat to make sure it is calling
for heat. (Do not cycle the thermostat on and off at this
time.)
2. Remove the access panel. Do not interrupt power to
the control board by opening any electrically
interlocked panels.
Table 23. All unit sizes: Troubleshooting with LED
Indicator Assistance for UT Control Board
LED Status
Indicates
Check/Repair
Slow Flash
Control OK, no call
for heat.
Not Applicable
Fast Flash
Control OK, call
for heat present.
Not Applicable
Steady Off
Internal control
fault, or no power.
Line voltage on terminals
120 and C on transformer.
2.
Low voltage (24V) on
terminals 24 and C on
transformer.
3.
5 Amp fuse on circuit board.
Steady On
Control internal
failure or bad
ground.
1.
Common side of
transformer grounded to
chassis.
2.
Loose spark ignitor.
2 Flashes
In lockout from
failed ignitions or
flame losses.
1.
Gas supply off or gas supply
pressure too low.
2.
Flame sense rod
contaminated or loose wire.
3.
Gas valve switch is off or
wires are not connected.
4.
Broken or cracked porcelain
on flame probe or spark
ignitor.
1.
Obstructions or restrictions
in appliance air intake or
flue outlet are preventing
proper combustion airflow.
2.
Moisture or debris in tubing
that connects pressure
switch and draft inducer.
3.
Airflow switch jumpered or
miswired.
1.
Open manual reset rollout
switch.
2.
Gas pressure too high, over
fire condition.
3.
Incorrect airflow due to
blockage or motor not
operating.
3. Observe the LED indicator on the control board (a
green LED labeled “OK” indicates system faults); check
and repair system as noted in the chart to the right.
Note: Air flow proving switch and power venter hose
barbs must be free of any dust or debris at all times.
Periodically check these openings and/or if any
problems occur.
3 Flashes
4 Flashes
GTND-SVX01B-EN
1.
Pressure Switch
open with inducer
on or closed with
inducer off.
Limit or rollout
switch is open.
5 Flashes
Flame sensed
while gas valve is
off.
1.
Flame probe miswired or
shortened.
6 Flashes
On-board
microprocessors
disagree.
1.
Thermostat is interfering
with control board.
49
Wiring Diagrams
Figure 42. All unit sizes: UT Control board
50
GTND-SVX01B-EN
Wiring Diagrams
Figure 43. Unit sizes 30–120: Natural & propane (LP)
gas with single-stage gas control & UT
control board
Figure 44. Unit sizes 60–120: Natural and propane (LP)
gas with optional two-stage gas control and
UT control board
Note: Refer to Figure 37, p. 37 through Figure 39, p. 38, Figure 43, p. 51,
and Figure 44, p. 51 for connecting the thermostat to the unit heater.
If using a standard low voltage thermostat with a sub-base switch for
fan control, connect the G terminal of the thermostat to the G terminal
of the unit heater.
Note: Refer to Figure 37, p. 37 through Figure 39, p. 38, Figure 43, p. 51,
and Figure 44, p. 51 for connecting the thermostat to the unit heater.
If using a standard low voltage thermostat with a sub-base switch for
fan control, connect the G terminal of the thermostat to the G terminal
of the unit heater.
GTND-SVX01B-EN
51
Wiring Diagrams
Figure 45. Unit sizes 150–400: Natural and propane
(LP) gas
52
Figure 46. Unit sizes 150–400: Optional two-stage
ignition
GTND-SVX01B-EN
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leader in creating and sustaining safe, comfortable and energy efficient environments, Trane offers a broad
portfolio of advanced controls and HVAC systems, comprehensive building services, and parts.
For more information, visit www.Trane.com.
Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.
© 2012 Trane All rights reserved
GTND-SVX01B-EN 16 Mar 2012
We are committed to using environmentally
Supersedes GTND-SVX01A-EN (01 Mar 2010)
conscious print practices that reduce waste.